Figure 23. — Sicyonia laevigata Stimpson. 

 Thelycum of female, X 10.4 (after Bur- 

 kenroad, 1934a). 



Telson ending in a strong point flanked by a pair 

 of shorter blunt spines ; sometimes with a pair of 

 mobile lateral spines distal to basal shoulders. 



Petasma of male with distolateral projections 

 extending straight distally. Thelycum most con- 

 spicuously marked by elongate plate arising on 

 13th somite (between 4th legs), with slender tip 

 extending to level of 11th somite (2d legs). 



Measurements.- — Length of body: males, 14 

 mm. ; females, 50 mm. 



Variations. — The angle of elevation of the ros- 

 trum varies with age. Nearly horizontal among 

 the young, it rises to as much as 35 degrees in 

 older individuals. The usual angle is somewhat 

 in excess of 20 degrees. The number of carinal 

 teeth on the carapace may be reduced to two 

 (Lunz, 1945). 



Color. — Yellowish brown ; carapace darker than 

 abdomen and sometimes bluish or greenish. 



Habitat. — A littoral species fairly common in 

 the Carolinas, especially on shelly bottoms of 

 harbors; shallow water to 49 fathoms. 



Type locality. — Charleston, S.C. 



Known range. — Cape Hatteras, N.C., to north- 

 west Florida; through West Indies to Colombia; 

 Pacific coast of Panama. 



Remarks. — This small species becomes sexually 

 mature at quite a small size (length of 18 mm.). 



Sicyonia parri (Burkenroad) 



Figure 24 



Eusicyonia parri Burkenroad, 1934a, p. 80, fig. 22. — Lunz, 1945, 

 p. 5, fig. 2. 



Recognition characters. — Resembling S. laevi- 

 gata; integument rather firm, almost smooth and 

 more or less sculptured. Rostrum elevated at angle 

 of about 15 degrees, armed dorsally with three 

 teeth not counting tip; terminal portion bearing 

 three teeth with rudiment of another between low- 

 er teeth. Postrostral carina armed with three large, 

 subequal teeth, anterior one slightly advanced 

 beyond level of hepatic spine. 



Abdominal segments marked by tergal carinae 

 notched behind on first to fifth segments. First 

 abdominal segment with carina produced into an 

 elevated anterior tooth, marked laterally with a 

 short anteromedian groove as in S. laevigata, but 

 reappearing below obliteration and continuing 

 conspicuously to ventral margin, not connected to 

 posteromedian pleural groove ventrally. Second 

 segment with carina cleft above juncture of tergal 

 grooves. First four segments each with a shallow 

 but perceptible posterior pleural groove. Fourth 

 segment with dorsal and ventral positions of 

 anterior tergal groove separated by narrow area 

 of obliteration. 



Petasma of male with distolateral projections 

 curved medially at tips; distoventral lobes con- 

 stricted abruptly near tip. 



Measurements. — Length of body: female, 25 

 mm. 



Habitat. — Shallow water to 14 fathoms. 



Kicu're 24. — Sicyonia parri i Burkenroad). Carapace and 

 abdomen in lateral view, approximately X 3 (after 

 Burkenroad, 1934a). 



34 



FISH AND WILDLIFE SERVICE 



