74 ZOOLOGICAL COLLECTIONS MADE DURING [Jail. 4, 



laden with ova in an advanced stage, in Trinidad Channel : and an 

 adult male and female at Borja Bay, in 14 fatlioms. 



In these specimens the larger hand is somewhat slenderer and the 

 fingers less incurved than in Dana's figure; and it is worthy of note 

 that the hand is nearly as much developed and the tubercles of the 

 fingers are as large in the female as in the examples I believe to be 

 males. 



The specimens referred to A. scabrodigitus by Dr. Cunningham 

 differ even more markedly from Dana's figure in the niucli longer, 

 slenderer hand and the entire absence of tubercles on the inner 

 margins of the fingers, and, it is very possible, may belong to a 

 distinct species; they are, moreover, of much larger size. 



Alpheus, sp. 



A specimen of an Alpheus was obtained at Portland Bay, at a 

 depth of 10 fathoms, on a bottom of hard sand, which I will not 

 regard as the type of a distinct species, on account of its small size. 



It appears to belong to the same section of the genus and to be 

 nearly allied to A. euchirus, Dana. Like it, the orbits are spinuhferous, 

 and the upper and lower margins of the larger hand are notched; 

 the smaller hand is also notched on its upper and lower margins, 

 and the dactylus is flattened, ovate, and clothed with long hairs; 

 there is a spine at the distal end of the third (but not the second) 

 joint of the third and fourth pairs of legs. 



Pandalus paucidens, sp. n. (Plate VII. figs. 6, 7.) 



Carapace with a prominent antennal and a very small pterygo- 

 stomian spine. Rostrum slender, slightly longer than the antennal 

 scale, about -l-toothed ; four of the dorsal teeth are on the carapace 

 in a median series ; the distal end of the rostrum is directed upward, 

 and is without teeth on its upper margin. Antennules considerably 

 longer than the rostrum. The postabdomen is strongly geniculated 

 beyond the third segment, which is unarmed on its dorsal surface. 

 The terminal segment in one specimen is broader, and its apex is 

 imperfect ; in the other it is very narrow and elongated, reaching 

 nearly to the end of the slender and narrow uropoda, and is tipped 

 with four cilia at its extremity. The outer maxillipedes (in the larger 

 individual) are robust, and reach (when thrown forward) slightly 

 beyond the antennal scale ; their terminal joints are slightly hairy. 

 The styliform terminal joints of the first legs are very slender and 

 acute. The rami of the uropoda are margined with long ciliae, and are 

 rounded at their distal ends ; the outer ramus is rather the broader, 

 with the sides parallel, the inner has the sides slightly convergent 

 to the apex. Length of larger specimen to end of rostrum rather 

 more than H inch. 



Two individuals, apparently males, were collected: — one at Tom 

 Bay, on a bottom of rock, kelp, and mnd ; the other in Trinidad 

 Cliannel, in 30 fathoms, on a sandy bottom. 



This species is principally distinguished by the small number of 

 teeth arming the margins of the rostrum. In the P. pubescentulus. 



