8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. »9 



Order COLOBOGNATHA 



Family SIPHONOPHORIDAE 

 SIPHONOPHORA MILLEPEDA, n. sp. 



A single mature female and a number of tiny young were found 

 beneath a rock in a cacao grove on the hills above Charlottstown, Man- 

 of-War Bay, Tobago Island, February 20, 1932. 



Diagnosis. — In this species the number of segments greatly exceeds 

 that of any other known member of the genus. Other distinctive char- 

 acters include the shape of the third antennal joint and the vestiture 

 of the antennae ; the very short, deeply emarginate hypostomal plate ; 

 and the reduced size of the first few pairs of legs. 



Fig. 2. — Siphonophora millcpeda. Head, antenna, and first segment, dorsal view. 



Description. — Length of the type 58 mm, width 1.3 mm. Number 

 of segments 190. Living animals cream-colored. 



Head shorter than the beak, narrow, triangular, the sides almost 

 straight (fig. 2). Beak very long and slender, nearly straight, hardly 

 deflexed, the tip approximating the ends of the antennae. Hypostomal 

 plate very short, broad, deeply emarginate. Antennae stout with 

 joint 3 thickest, equalling joint 6 in length, the other joints shorter; 

 joints I to 5 beset with hairs of various lengths ; joints 6 and 7 much 

 more densely covered with shorter hairs of uniform length. 



Body densely beset with straight, erect hairs varying in length 

 from moderately short to ones 4 or 5 times as long. Segments very 

 strongly convex longitudinally, dorsum moderately depressed trans- 

 versely. Posterior margin of segments finely and uniformly serrate. 



The anal valves together are hemispherical and covered with hairs 

 similar to those on the segments. Preanal scale transverse behind, 

 with fewer and shorter hairs than the valves. 



