154 PROCEEDINGS OF THE ACADJpJpFT^P-^ 



long ; its front outline blunt, triangular or rounded ; whole upper front and 

 end margin minutely serrated with hispidiform teeth ; lower margin with 

 four small simple ones near the end. Eye with a spine at the inner apex ; 

 squamiform appendix to the antennae elongate-triangular in shape, with 

 pointed end, not reaching beyond thft rostrum. External maxillipeds reach- 

 ing nearly to extremity of rostrum, and provided with both exognath and 

 epignath ; antepenult joint broad, with a strong spine at the external apex. 

 Feet of the first, second and third pairs provided with an epipod. Abdomen 

 with the dorsum rounded; third joint a little prominent, with an obtusely 

 triangular, not conspicuous tooth at the posterior margin ; lower margins 

 of the segments smooth and obtuse, except the fourth and fifth, which form 

 teeth. Four pairs of dorsal aculei on the terminal joint. Length about one 

 inch. 



Easily distinguished from the other North Pacific lamelli-rostral species by 

 the serrated margins of the dorsal teeth and rostrum. It approaches nearest 

 to H. spina (Sower bei), but has three supra-orbital spines instead of two. From 

 H. pecteni/era it differs in the non-pectinated margins of the abdomen. 



Seven specimens of this fine species were dredged in February and March, 

 by Lieut. White, in different parts of the Sound, viz., in Hale's Passage, 10 

 fathoms, soft bottom ; off Lummi I., in 8 — 12 fathoms, shelly; near San Juan 

 I., in 2 — 4 fathoms, mud. 



HlPPOLYTE SUCKLEYI. 



Carapax with the anterior half of the dorsum crested and sloping forward ; 

 no supra-orbital spines ; a strong antennal and pterygostomian spine present. 

 Fourth joint of abdomen acute below. Rostrum large, but scarcely as long 

 as the carapax, curved, rather broad and lamelliform, with a slender acute 

 tip ; lower margin four-toothed ; upper margin including crest of carapax six- 

 toothed, beginning at the anterior third of the length of the rostrum. External 

 maxillipeds of moderate size, reaching nearly to extremity of antennary ap- 

 pendix, and provided with both exognath and epignath. Feet long, the last 

 pair reaching nearly to the tip of the rostrum ; first pair only provided with an 

 epipod ; dactyli of the last three pairs elongated, with only one terminal un- 

 guiculus. Abdominal segments with smooth edges ; superior margin of third 

 segment obtuse. Length 1£ inches. 



In the characters of the dorsal crest and rostrum it is much like //. Gai- 

 mardi, but it has no spine over the eye. From H. Fabricii it differs in having 

 more numerous teeth on the superior margin of the rostrum, some of which 

 are placed nearer to its extremity. It has less numerous superior teeth than 

 occur in H. Layi. 



Dredged in the circumlittoral zone. We have conferred upon this species 

 the name of our friend Dr. Suckley, one of the earliest and most successful 

 investigators of Pugettian Zoology. 



HlPPOLYTE STYLUS. 



Body slender ; abdomen strongly genticulated. Carapax smooth ; back not 

 crested except for a short distance anteriorly. There is an antennal spine, 

 but neither supra-orbital nor pterygostomian. Rostrum slender, somewhat 

 styliform, perfectly straight, and equal to the carapax in length ; it is armed 

 above with four or five teeth near the base, while the anterior two-thirds is 

 edentulous ; below there are five or six teeth. Antennary appendix oblong, 

 scarcely shorter than the rostrum, and obliquely truncate at the end. Exter- 

 nal maxillipeds very small, reaching only to the extremity of the peduncle of 

 the antenn<e, or to the basal third of the rostrum ; they are provided with an 

 epignath, but no exognath. None of the feet have an epipod. Terminal joint 

 of the abdomen with four pairs of dorsal aculei. Length l£ inches. 



Taken in the Straits of De Fuca by the U. S. Exploring Expedition. 



[June, 



