Cumacea: 3. Bodotriidae, 5. Stephanomma, 6. Zygosiphon 



41 



the peduncles of the uropods. Eye situated on the broad blunt-ended equi- 

 valent of an eyelobe, and composed of 10 corneal lenses encircling a central 

 one. Below this region a semicircular 

 orifice leading to the branchial cham- 

 bers can be closed by the triangular 

 exopods of maxilliped 1. Antenna 1 

 small, the three joints of the pe- 

 duncle subequal in length, flagellum 

 very short, accessory undeveloped. 

 Maxilliped 3, 2^^ joint scarcely 

 longer than the 3*^ and 4P^ com- 

 bined, not apically produced. 4*^ 

 joint broadly produced to a pointed 

 apex. Peraeopod 1 slender, attached 

 unusually far down on the sides 

 under the carapace. Peraeopod 2 

 little more than half as long as 

 the 1^*. Peduncle of uropods quite 

 smooth, considerably longer than 

 the subequal rami; the lanceolate 

 endopod with medial margin finely 

 serrate and carrying a row of 5 short 

 spines along the middle. L. 9 adult about 9-5 mm, or including uropods 

 about 11 mm, <5 unknown. 

 West Indies, St. Martin. 



6. Gen. Zygosiphon Caiman 



1907 Zygosiphon, Caiman in: Tr. zool. Soc. London, ». I81 p. 25. 



Pseudorostrum with frontal projections wide apart. Branchial siphons 

 very long and widely separated. All five pedigerous segments free. Uropods 

 with endopod of two joints, the second joint much the shorter. 



1 species. 



1. Z. mortenseni Calm. 1907 Z. m.. Caiman in: Tr. zool. Soc. London, 

 V. I81 p. 25 t. 7 f. 1—19. 



Fig. 17. 

 S. goesii (9) Sars. 



Fig. 18. 

 Z. mortenseni (5) Caiman. 



Pseudorostrum with plates meeting in front of eyelobe, then broadly 

 divergent with antero-lateral tooth on each side in advance of their short 



