BULLETIN OF THE UNITED STATES FISH COMMISSION. 
56 
consider how little is really known about these genera, and how dissimilar the females are, it seems 
better to retain them as distinct genera until detailed knowledge of the anatomy of the various species 
furnishes the basis for more accurate classification. Sars in his “Account of the Crustacea of Norway” 
lias thus regarded them. 
Hyptius is more closely allied to the members of Alhelges than to those of either of the other genera, 
but its female presents characters, especially in the uropoda and pleopoda, which seem to prohibit its 
reference to that genus as defined at present. As writers on this family prefer to institute tentative or 
even undefined genera for new species where there is doubt as to their exact position, I suggest that 
resupincitus and hyptius be placed in the following tentative genus, having tire characters given below 
as its probable limits. 
STEGOPHRYXUS, nov. gen. 
Male, abdomen ovoid, without appendages or traces of segmentation. An term ul;e 3-jointed, 
antennae 8-jointed. Female, abdomen distinct from thorax, 6-jointed, with five pairs of triramous 
pleopoda and a pair of oval uropoda. Legs modified for clasping dorsal ward. First five segments 
of thorax crowded anteriorly. Nearly symmetrical. 
dr sy slv =to roof or cover (in allusion to marsupium covering the parasite when on host). 
BIBLIOGRAPHY. 
1. Bate. Spence & Westwood. History of British Sessile-eyed Crustacea, vol. n, pp. 232-250, 1868. 
2. Giard. “ Sur la Phylogenie des Bopyriens.” Compt. Rendus, tome 104, 1887. 
3. Hesse. Annales Science Naturelles, ser. 4, xv, pp. 112-115, 1861; s6r. 5, hi, pp. 226-242, 1865. 
4. Muller. Jenaische Zeitschrift, vi, pp. 57-60, 1870. 
5. Saks. Account of Crustacea of Norway, n, pts. 3-8. 1897. 
DESCRIPTION OF PLATES. 
Plate 9. 
Fig. 1. Herm it crab with parasite attached. Natural size. 
2. Anterior portion of adult female, ventral, somewhat diagrammatic. On the right side, all the brood-plates except the 
first, and on the left the fourth (Bp t ) and fifth have been cut away. The third (Bp s ) is reflexed to show the 
second ( Bp.,).) Abp u Pbp l = the anterior and posterior blades of first brood plates. Pif, Pr., = pereiopoda of 
first and second parrs, respectively. Dbp 3 = dorsal portion of the third brood plate. 
3. Adult female with marsupium distended with, eggs. Dorsal. x8. Bpi = funnel formed by first brood-plates. Dbp. t , 
Dbp x = dorsal portions of third and fourth plates, respectively. Bp-, = the distended fifth brood-plate with the 
pouch (Po) at its posterior angle. Pr it Pr 0 , and Pr 7 = Pereiopoda of fifth, sixth, and seventh segments, respect- 
ively. 4?,, Rami of first pleopod. Ur = Uropoda. 
4. (The dotted outline shows the position occupied by the male.) Adult femalcwitb empty marsupium. Ventral. x7. 
Bp,, Bp.., Bpi = brood plates of first, third, and fifth pairs, respectively. Po = pouch at angle of fifth pair. 
Vpl x = enlarged ventral ramus of the first pleopod. Vpl, = ventral ramus of second pleopod. 
5. Left imaxilliped of adult female. Ventral (outer) surface. <15. Ab = anterior blade. P b = posterior blade. X = 
point of attachment'. (Two of the processes at the side of the head are shown.) 
Ci. Head of the adult female. Dorsal. 17. Fr = median part of front. Mnd = mandibles. La = dorsal part of labrum. 
Mxp = maxillipeds. Dbp 3 = dorsal part of third brood plate. T., = antenna. C'tt = “cushion.” &h = “shield.” 
E = eye 
7. Head of adult, female. Antcro-ventral. Free-hand. (The posterior brood plates are removed, and the first pair with 
the maxillipeds are reflexed to show the ventral surface of the head, etc. The base of the right maxilliped is 
cut away to show the processes at border of head (Pro).) A x = antennula. A., = ridge which forms the basal 
joint of the antenna. La — indexed margins of labrum. Mx x - maxillula. Mx» = maxilla. Mxp = maxilliped. 
Pp = leaf-like platen at median posterior border of head. 
•S. Abdomen and posterior part of thorax of the same. Ventral. < 8. (All the brood plates except the pouch-like posterior 
angle (Po) of the fifth plate have been removed.) A'=keel of the first abdominal segment (see page 54). 
If. PI, = pleopoda of first and third segments, respectively. 
Plate 10. 
lug. 1. Adult male. Dorsal, x 18. A., = Antenna. E = eye. Int = intestine. Lit = heart. 
2 . The same. Under surface of head, x 33. The right pereiopod has been removed; x marks its position. A t =anten- 
nules. Xa = the inflexed border of labrum. Mnd = basal portions of the mandibles, the median and apical 
parts being concealed by the labrum and liypopharynx. iix., = maxilla. Mxp = maxillipeds. 
3. Cryptoniscicl from young female. Lateral, x 87 (?)'. A x = antennula. A., = antenna. Ep — epimeron of first 
thoracic segment. Ur = uropod. PI - pleopoda. 
4. The same. Under surface of head, x 165 (?). A t = Antennula. R = rostrum. 
5. The same. Pleopod. of tided abdominal segment. 105 ( ? ) . Ex = outer ramus. En = inner ramus. 
Ci. Adult female. Musculature (diagrammatic) of one of the first four thoracic pereiopoda. Lateral, x 30. (From speci- 
mens cleared in cedar oil and from reconstructions.) Cu =" cushion.” Sh = “ shield.” Bp = base of brood 
plate (mostly cut away). Ex= extensors. 
7. Adult female. Musculature (diagrammatic) of pereiopod of sixth or seventh segment. To show approach to the simpler 
nude pereiopod. Lateral, x 30. Ex. = extensors. 
s. Adult, nude. M usculature of .pereiopod.. -Lateral. x60. Ep = border of segment. Fl = flexors. Ex = extensors. 
9. Larval female (metaphryxoid stage). Dorsal, x 18. (Only the thorax and part of the abdomen are shown; most of 
the pereiopoda are bent ventrally and are hidden by what may be the epimera (Ep).) Fr = front. A« = anten- 
nae E=o yes. Pr 7 = pereiopod of seventh pair. PI, — pleopod of second pair. 
10. The same. Ventral, x 10. .(Showing the positions in which the three males (?) were found)* <f = position of the 
one which was in the marsupium. Mnd = mandibles. A, = antennula. JSp ( , Bp t , Bp & = brood plates of first, 
fourth, and. fifth pairs. Pr 6 — pereiopod of fifth pair. Vpf = ventral ramus ot first pleopod. Ur = uropoda. 
