161 



Hippolyte layi Owen, \. c., p. 90, p. xxvii, f. 3. 



Owen's description of this species is very brief and the rostrum only 

 is figured. Two examples in the collection of the California Academy 

 from the west coast of Alaska, north of Behring's Straits, agree so 

 nearly with H. layi in the form of rostrum that I believe them iden- 

 tical. According to Owen the rostrum has ten spines above and four 

 below, besides the terminal tooth. The specimens above referred to 

 have, as in Owen's figure, a long lamellate ensiform rostrum, below 

 well in front of the eyes are five nearly equal teeth, directed forwards, 

 rostral tip long and sharp ; above with seven unequally spaced teeth, 

 the three posterior ones near together and on the carapax. Rostrum 

 as long as or longer than the carapax, and has a thickened midrib 

 from which the spines project as lamellae of varying width. Antennal 

 spine prominent. One specimen has a prominent spine upon the ab- 

 domen at the bend of its central segment. External maxillipeds 

 comparatively short, and hidden entirely beneath the antennal scales. 

 Basal joint of antennulse spinose. Total length If inches. 



Palaemon longipes. Nov. sp. 



Rostrum longer than antennal scale, reflexed towards extremity, 

 armed with eight teeth above, and six below, without including the 

 slender bifid terminal tooth. First teeth on upper margin, small, sit- 

 uated on the carapax, and separated from the following six, which are 

 close together, eighth tooth nearer the tip than to the seventh tooth. 

 Six lower teeth nearly equidistant, the first (beginning at the rear) 

 immediately beneath the sixth of the upper series, the sixth beneath 

 the eighth upper tooth. A spine on each side of the carapax, imme- 

 diately above the antennal scale, and a second spine farther back and 

 slightly below the first. Peduncle of autennula? shorter than the an- 

 tennal scale, basal joint armed with a strong spine externally, two 

 external flagella united for some distance, the inner of the two very 

 short, the outer very long, exceeding in length the internal flagella. 



Autennal scale longer than peduncle of autennulae, flagellum as long 

 as the body from tip of rostrum to tail. 



External maxillipeds, when extended, reaching somewhat beyond 

 the antennal peduncle, slender, setose, especially on the terminal joint. 



First pair of limbs slender, cylindrical, meros half as long again as 

 ischium, carpus longer than meros, and three times as long as the ma- 

 nus ; fingers blue, closely fitting, nearly as long as palmer portion of 

 manus. 



Second pair of legs exceedingly long and slender (in the male), is- 

 chium comparatively short and very slender; meros more than twice 

 as long as ischium, and stouter; carpus exceeding the meros by two* 



ESSEX INST. BULL. X 18 



