40 University of California Publications in Zoology [Vow 28 
Dimensions.—Type: length of body 18 mm., of second chelipeds 16 mm., of 
hand 7 mm., of carpus 3 mm. 
Type Localityx—Santa Catalina Island, California. 
Distribution—From Santa Catalina Island, California, to Gulf of California 
(Rathbun). 
Remarks.—The specimens in the U. 8. National Museum, collected in the Gulf 
of California by the ‘‘ Albatross,’’ from which the above figure was taken, ‘‘agree 
with Holmes’s description, except that the fingers of the second pair of feet are 
only a little over half as long as the palm and the posterolateral angle of the 
sixth abdominal segment is subacute’’ (Rathbun). Nobili (1917, p. 5) suggests 
the name holmesi for Periclimenes tenwipes (Holmes) which he says is preoccupied 
by P. tenuipes (Leach), but as there does not seem to be any original description 
I have retained Holmes’s name. Borradaile says (1917, p. 376), ‘‘I have not 
been able to find the original description of it [P. tenwipes (Leach) ].’’ 
Family PANDALIDAE 
Rostrum laterally compressed, long, and armed with teeth or spines. Mandibles 
with incisor process and. palp of two or three segments. First pair of legs 
slender and usually simple, but often only apparently so, being at times micro- 
scopically chelate. Second pair long, slender, and chelate, with segmented carpus. 
Kry TO THE CALIFORNIA GENERA OF THE PANDALIDAE 
I. Antennules not longer than the carapace. No laminate expansions on the 
merus of the third maxilliped and the ischium of the first legs. 
Pandalus, p. 40. 
II. Antennules twice the length of the carapace. Merus of third maxillipeds and 
ischium of first legs with a longitudinally developed laminate expansion 
fringed with long hairs. 
Pandalopsis, p. 46. 
Genus Pandalus Leach 
Rostrum long and prominent, armed above with spines, which are for the 
greater part movable, and below with fixed and rigid teeth; rostrum continued 
backward upon the carapace as a median dorsal carina. Antennules not longer 
than the carapace. Mandible with a three-jointed palp. Second pair of legs 
unequal, with much segmented carpus. 
None of the species at present known from California have median spines on 
the abdomen. 
KEY TO THE CALIFORNIA SPECIES OF PANDALUS 
I. Dorsal spines not reaching behind middle of carapace; tip of rostrum acum- 
inate, often with a small tooth behind the tip dorsally (P. jordani and 
P. platyceros), or trifid (P. montagui tridens). 
A. Sixth segment of abdomen slender, about three times as long as wide. 
Carapace smooth and shining. 
