362 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxni. 



curved, reaching back to the thorax. Second maxilhpeds swollen but 

 little and ending in short claws. All the swimming legs biramose; 

 basal joints of the first and fourth pairs not united across the mid-line; 

 rami lamellar and destitute of setse or spines, those of the third pair 

 two-jointed, of the other pairs one-jointed; fifth legs on the ventral 

 surface close to the base of the abdomen. Egg-strings narrow, a lit- 

 tle longer than the body. Length, 22.5 mm. 



(Laminifera, lamina and fero, to bear.) 



Male. — Unknown. 



This genus was founded by Milne Edwards in 1840 upon female 

 specimens obtained near Tongatabu; the host is not given, but was 

 probably a shark. Milne Edwards named the genus Phyllo'phora, but 

 this name had been preoccupied three times previously, for a genus of 

 birds in 1812, a genus of flies in 1838, and again for a genus of mam- 

 mals in the same year; accordingly Poche suggested the name Lami- 

 nifera in 1902. 



Milne Edwards gives no genus diagnosis, but only a short descrip- 

 tion, from which and from the two excellent figures he published the 

 above diagnosis has been deduced. There is some doubt on one point, 

 and what are here given as the fifth legs may prove, on later invest- 

 igation, to be the sixth pair, attached to a well difl"erentiated sixth 

 segment. 



Genus ECHTHROGALEUS Steenstrup and Lutken. 



Pandarus (part) Milne Edwards, 1833. — Johnston, 1835. 

 Dinematura (part) Burmeister, 1834. — Guerin, 1837. 

 Dinemoura Milne Edwards, 1840. — Baird, 1850. 



Echthrogaleus Steenstrup and Lutken, 1861, p. 380 (Echthrogaleus coleoptratus 

 Steenstrup and Lutken, 1861, p. 380, pL viii, fig. 15). 



Female. — Carapace large and well rounded; frontal plates distinct 

 but not prominent; posterior lobes long and blunt; dorsal surface 

 with a longitudinal groove on either side^ a transverse groove across 

 the mid-line, and a short groove across the lateral area on either side; 

 three small eyes, the lenses close together and arranged in the form of 

 a triangle. Three free segments, each bearing a pair of dorsal plates; 

 first two pairs rudimentary, first pair lateral, second pair median, 

 third pair well developed and extending the entire width of the body. 



Genital segments enlarged, sometimes wider than the carapace, 

 with a deep posterior sinus and long rounded lobes. A small median 

 lobe at the base of the sinus represents the sixth thorax segment, and 

 corresponds to the similar lobes found in Pandarus, Dinematura, etc. 

 It is on the ventral surface and entirely concealed between the geni- 

 tal segment and abdomen (coleoptratus), or on a level with the dorsal 

 surface and visible (denticulatus and torpedinis) . Abdomen small, 

 one-jointed, concealed beneath the genital segment or partially visi- 



