ATJSTBALTAN MALACOSTBACA. 189 



Alpheus strenuus, Dana, U. S. Explor. Exped., Crust, i., p. 543, 

 pi. xxxiv., fig. 2 (.1152). 



Eostrum elongate, acute, the surface between the eyes obscurely 

 carinate. Basal squame of the external antennae not longer than 

 the peduncle. Second joint of the internal antennas nearly twice 

 as long as the first. Anterior legs very unequal, the hand of the 

 larger with a concave and not triangulate inf ero-marginal sinus, 

 the arm acutely unidentate at the apex. Smaller hand narrow 

 oblong, somewhat pubescent, fingers densely hirsute within, hairs 

 covering wholly extremity of moveable finger. [J).] 



Torres Straits ; Sydney. Found also in the Philippines, and 

 at Tongatabu. 



353. Alpheus Comatularum. 



Alpheus Comatularum, Haswell, Proc. Linn. Soc. N.S.W., 

 Vol. vi. 



Carapace broad, somewhat depressed. Eostrum very long, 

 one-third of the length of the carapace, slender and acute, con- 

 tinued backwards over a third of the length of the carapace as 

 an acute, prominent, arched crest. A prominent, acute supra- 

 orbital spine more than one-third of the length of the rostrum. 

 External antennae with two acute spines at its base, the outer 

 very large. Basal spine of internal antennae long, acute. 

 Propodos of large hand swollen, smooth ; immobile finger nearly 

 straight, with a hairy protuberance at the base of its inner border ; 

 mobile finger compressed, slightly hooked at the end, with a 

 large recurved tooth on its trenchant border at the base. Length 

 1| in. Carapace with longitudinal stripes of brownish purple, 

 with a narrow mesial white line, which is continued on the two 

 first abdominal segments ; at the sides three short white mark- 

 ings. Abdomen with broad brownish purple and narrow white 

 lines ; bases of antennaa purple, longitudinal stripes of purple on 

 the ambulatory legs. Large hand marked with longitudinal 

 lines of light brown, bordered by narrow darker bands. 



Dredged in a few fathoms of water in Albany Passage, near 

 Cape York, Queensland, during the cruise of H.M.S. " Alert," 

 in those waters. They were invariably found clinging to the 

 arms of a species of Comatulid to which their markings gave them 

 a general resemblance. Other commensals of these Comatulids 



