PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 441 
and appears to have been more common than P. Montagui, which oecur- 
red with the leptocerus in 30 and 45 fathoms, and alone in 28 fathoms.* 
Pandalus tenuipes, sp. noy. 
This species is smaller but has a proportionally thicker body than P. 
_Montagui, and the surface of the carapax and abdomen are very mi- 
nutely roughened, somewhat as in the last species, but the punctate 
ridges are much less conspicuous and much more thickly crowded than 
in that species. 
The carapax, including the rostrum, is about two-fifths of the entire 
length, and the carapax proper is nearly as long as the rostrum, slightly 
swollen in the middle, somewhat contracted in front, as seen from above, 
and with the rostral carina extending back to about the middle, and 
armed, at about a third of the way from the front, with two to four 
slender teeth, crowded close together and rapidly decreasing in size 
posteriorly ; but between these teeth and the posterior tooth of the ros- 
trum the carina is wholly unarmed. The rostrum is curved upward a 
little more than in P. Montagui, is not expanded below, and is armed 
the whole length above with eight to ten teeth, which are usually more 
widely separated distally, though in some specimens the terminal two 
or three are crowded together near the tip; beneath there are six to ten 
small teeth. 
The eyes are black and as broad as long, but shorter than in P. Montagui. 
The peduncle of the antennula reaches to near the middle of the antennal 
seale, and the two distal segments are subequal in length and each about 
as broad as long. The antennular flagella are subequal in length and 
much longer than the carapax, including the rostrum; the proximal 
half of the outer flagellum is very much thickened, the terminal por- 
tion very slender, as is the inner flagellum throughout. The antennal 
scale is approximately four-fifths as long as the rostrum, and of very 
nearly the same form as in P. Montagui. The external maxillipeds are 
very slender, reach to about the tip of the rostrum, and have well-de- 
veloped exopods, fully half as long as the ischium; the ischium is a 
little longer than the rest of the endopod, which is composed, as in P. 
Montagui, of only two distinct segments beyond the ischium, and in 
this case these two segments are subequal in length. 
The first pair of legs are very slender and reach to the tips of the ex- 
ternal maxillipeds. The second (chelate) legs are exactly alike, and 
reach to or considerably by the tips of the antennal scales. The ischium 
is a little longer than the merus; the carpus a little less than twice as 
long as the merus, slightly shorter than the antennal scale, and com- 
posed of about fifteen segments, of which the proximal are separated by 
*In the report on the dredgings in the region of George’s Banks ( Smith and Har- 
ger, Trans. Conn. Acad., iii, pp. 1-57, pls. 1-8, 1874), “Pandalus annulicornis” is re- 
ported from the following stations: 6, 30 fathoms; ¢, 28 fathoms; d, 50 fathoms; e, 
60 fathoms; g, 430 fathoms; and q, 45 fathoms; but on re-examining the specimens I 
find all those preserved from }, e, and g are P. leptocerus, the single specimen from ¢ 
is P. Montagui, while from d and q there are specimens of both species. 
