35 



narrow, sublinear, with all the segments well denned. Eyes wanting. Superior 

 antennae (in female) distinctly 4-a-rticulate. Mandibles well developed, and resem- 

 bling in structure those in the genus Typhi otanais, the molar expansion being 

 rather strong, cylindric, and armed at the tip with dentiform tubercles. Cheli- 

 peds comparatively small, with the hand scarcely dilated. The first 3 pairs of 

 pereiopoda of similar structure, and more slender than the 3 posterior. Pleopoda 

 (in female) imperfectly developed, forming simple oval lamellae, without a trace 

 of sets. Uropoda rather slender, biramous, rami unequal, Inarticulate. Incuba- 

 tory pouch normal. 



Remarks. . — The most prominent character of this genus is the simple 

 structure of the pleopoda in the female, and it is indeed from this character, 

 that the generic name has been derived. In outward appearance, as also in the 

 structure of the several appendages, it exhibits a close resemblance to the genus 

 Leptognathia ; but the structure of the mandibles is very different, and agrees 

 much more closely with that found in the genus Typhlotanais. The genus con- 

 tains as yet but a single species. 



Haploeope angusta, G. 0. Sars. 



(PL XV. fig. 2). 

 Haploeope angusta, G. 0. Sars. 1. c. p. 51. 



Specific Characters. --9- Body extremely slender and narrow, being 

 fully 10 times as long as it is broad. Cephalosome rather small, slightly nar- 

 rowed anteriorly, front truncated. 1st free segment of mesosome but little smaller 

 than the next succeeding ones and somewhat dilated in front, last segment 

 the smallest. Metasome about the length of the last 2 segments of mesosome 

 combined, and nearly of uniform breadth throughout, terminal segment of medium 

 size, and angularly produced in the middle. Superior antennae somewhat shorter 

 than the cephalosome, basal joint only attaining the length of the 2 succeeding 

 joints combined, last joint narrow, conic. Chelipeds rather small, hand about the 

 length of the carpus, fingers shorter than the palm. 1st pair of pereiopoda 

 scarcely longer than the 2 succeeding pairs; the 3 posterior pairs a little stronger, 

 and having the outer joints spinous. Uropoda about half the length of the me- 

 tasome, inner ramus rather elongated, outer scarcely more than half as long and 

 much narrower. Length 1.70 mm. 



Remarks. — As stated above, this is the only species as yet known of 

 the genus, and may easily be recognized by its slender, narrow body, and the 

 simple, lamelliform pleopoda. 



