CAPRELLIDAE OF WESTERN NORTH ATLANTIC 19 



The abdomen also appears to vary little in Caprella. In the males 

 it bears a pair of imiramoiis appendages at its proximal end; laterally 

 it has a pair of lobes. The sm-face of the abdomen is usually covered 

 with nmnerous setae, and occasionally the ventral surface between 

 the lobes is raised to form a hump. The female abdomen is similar to 

 that of the male except that it lacks appendages. 



The propodus of ganthopod 1 is usually triangular in outline and 

 invariably has a pair of proximal grasping spines. 



Caprella andrcae Mayer, 1890, new rank 



Figures 8, 9, 55 



Caprella aadifrons [not Latreille]. — van Benedcn, 1859, pp. 78-81, pi. 1, figs. 

 9-11; 1861, p. 145.— [?] Stock and Bolklander, 1952, p. 3. 



Caprella aculifrons f. Andreae Mayer, 1890, pp. 51, 55-56, pi. 2, fig. 38, pi. 4, 

 fig. 56, 70-71; 1903, pp. 80-81.— Chcvreux and de Guerne, 1893, p. 3.— 

 d'A. Thompson, 1901, p. 41. — Stephensen, 1915, p. 53. — Chevreux and 

 Fage, 1925, p. 452, fig. 430a.— Ruffo, 1938, p. 150 [in part].— Utinomi, 

 1947, pp. 71-72. 



Caprella acutifrons f. andreae. — Stephenson, 1929a, p. 182. 



Diagnosis. — Cephalon with anteriorly directed triangular pro- 

 jection, peduncle of antenna 1 robust in males, palm of propodus of 

 pereopods 5-7 convex with medial grasping spines. 



Description. — Body smooth except for anteriorly directed tri- 

 angular projection on cephalon, pleura developed on pereonites 3 and 

 4 in larger males. Length of largest male 12 mm, female 9 mm, 

 smallest ovigerous female 7 mm. 



Peduncle of antenna 1 inflated in males, sparsely setose. Antenna 

 2 typical of genus. 



Mouthparts typical of genus, lacinia mobihs of right mandible 

 5-toothed, 



Gnathopod 1 typical of genus, dactylus serrate, propodus with 2 

 proximal grasping spines. Propodus of gnathopod 2 in males with 

 proximal poison tooth and distal rectangular projection, palm densely 

 setose; in females propodus with proximal poison tooth, distal pro- 

 jection and small middistal projection; dactylus strong and con- 

 stricted medially. 



Gills oval and usually quite large and inflated in males, females 

 eUiptical. 



Propodus of pereopods 5-7 with 2 grasping spines at midlength, 

 palm convex. 



Abdomen typical of genus. 



Variation, — The inflation of antcima 1 and the development of 

 pleura increase as the size of the individual increases, large males 

 having an unusually enlarged antenna 1 and well-developed pleiu-a. 



