CAPRELLIDAE OF WESTERN NORTH ATLANTIC 41 



Description. — Body with anteriorly du-ected cephalic spine, 

 female with variously developed spines on pereonites 1-7. Length 

 of largest male 21 mm, female 12 mm, smallest ovigerous female 

 6 mm. 



Antenna 1 usually longer than one-half body length, flagellum with 

 as many as 9 fused articles in males, up to 4 in females. Length of 

 antenna 2 variable. 



Mouthparts typical of genus, lacinia mobilis of right mandible not 

 distinctly 5-toothed. 



Propodus of gnathopod 1 with 2 proximal grasping spines, grasping 

 margin of dactylus and propodus serrate. Propodus of gnathopod 2 

 elongate in males, palm with 2 strong teeth and distal rectangular 

 projection ; female propodus not so elongate as male, palm with proxi- 

 mal spine, small distal tooth and distal rectangular projection. 



Gills elliptical. 



Propodus of pereopods 5-7 with 2 proximal grasping spines. 



Abdomen of male and female typical of genus except with raised 

 medial projection. 



Variation. — The females with the most pronounced dorsal body 

 spination had 1 knob at the posterior of pereonite 1, 1 pair of knobs 

 a})ove the gills on pereonites 3 and 4, 1 knob at the posterior of pereon- 

 ite 4, 2 pairs of knobs at midlength of pereonite 5, 1 pair of knobs at 

 midlength of pereonite 6, and a pair of knobs at the posterior of 

 peronite 7. This spination showed varous degi'ees of reduction from this 

 pattern with the knob at the posterior of pereonite 4 usually being 

 present. The males occasionally bore 2 paii's of knobs at midlength of 

 pereonite 5 and a j)air of knobs at midlength of pereonite C. 



The number of fused articles in the flagellum of antenna 1 varied 

 from 6-9 in males and from 2-4 hi females. Mayer used this character 

 for separating C. scaura f. cornuia from C. scaura f. typica and diceros 

 since C. scaura f. cornuia does not have fused articles in the flagellum 

 of antenna 1. 



Distribution. — Type-locality: Riviere Noire, Mauritius. 



Other records: St. CroLx and vSt. Barth^lemy, Virgin Islaiul; 

 Vitoria, Rio de Janeiro, and 28° S., Brazil; South Africa; Mejilloncs, 

 Chile; Cumberland Bay, Isla Mds a Tierra; Honshu, Kyushu, and the 

 Inland Sea, Japan; Vladivostok; Sydney and Kangaroo Island, 

 Australia. 



New records: Cocos Island, Costa Rica; off Mayagiiez, Puerto 

 Rico; Ilha Sao Scbastiao and Santa Catarina, Bra/.il; Falsc^, Bay, South 

 Africa. 



Remarks. — Mayer (1890, 1903) described 6 varieties of C. scaura 

 to which Utinomi (1947) added a seventh, C. scaura f. hamata,. Mayer's 

 varieties C. scaura f. typica (1890), diceros (1890), cornuia (1890), 



