Type locality.- — Crooked Island, Bahamas. 

 Known range. — Beaufort, N.C. ; Florida ; West 

 Indies to Curacao. 



Sicyonia brevirostris Stimpson 



Figures 25-26 



Sicyonia brevirostris Stimpson, 1871b, p. 132. — Hay and Shore, 

 1918, p. 380, pi. 25, figs. 2, 4. 



Eusicyonia brevirostris: Btirkenroad, 1934a, p. 84 (rev.). — 

 Lunz, 1945, p. 6, fig. 3. 



Recognition characters. — Integument firm, 

 much sculptured, especially abdomen; abdomen 

 with scattered tubercles, and whole body with 

 covering of short, fine hairs. Rostrum short, ele- 

 vated, slender, narrowing considerably to tip; ex- 

 tending beyond midpoint of cornea; armed 

 dorsally with two (occasionally three) teeth not 

 counting tip; terminal portion divided into two 

 or three teeth with ventral tooth projecting dis- 

 tally farther than dorsal tooth. High postrostral 

 carina with three or four teeth behind orbital 

 margin. Antennal angle armed with a small spine. 

 Hepatic spine well developed. Ocular stylets long. 



Abdominal segments marked by prominent 

 tergal carinae deeply notched behind on first to 

 fifth segments. First abdominal segment with 

 carina produced into an elevated anterior tooth; 

 marked laterally by four grooves, an antero- 

 median and posteromedian pleural, a posterior 

 pleural and posterior tergal. Second and third 

 segments grooved with two tergals, two median 

 pleurals extending far dorsad, and a posterior 

 pleural. Fourth segment grooved with two tergals 

 and one pleural; fifth with two tergals. Sixth 

 segment with a posteromedian pleural, anterior 

 tergal, and a longitudinal groove. Fifth and sixth 

 segments each with carinal tooth directed pos- 

 teriorly. Pleura of first four segments armed 

 with an anterior ventral angle; angle produced 



Figure 25. — Sicyonia brevirostris Stimpson. Carapace 

 and first two abdominal segments in lateral view, 5 mm. 

 indicated (after Lunz, 1945). 



Figure 26. — Sicyonia brevirostris 

 Stimpson. Petasma of adult 

 male, ventral view, 1 mm. indi- 

 cated. 



into blunt, outward pointing spine on third and 

 fourth, sometimes also on second segment. Last 

 three segments armed with posterior ventral tooth. 

 Telson ending in a strong point flanked by a 

 shorter pair of subterminal, often obsolescent, 

 spines. 



Petasma of male with distolateral lobes curved 

 medially, distoventral lobes curved laterally. 



Measurements. — Length of body: males and fe- 

 males 153 mm. 



Variations. — This species exhibits considerable 

 variation in degree of elevation of the rostrum 

 (5-45 degrees). The rostral length also varies, 

 and length and angle of elevation tend to decrease 

 with increasing age, but this tendency is highly 

 irregular. 



Considerable variation in placement of teeth 

 on the carapace occurs. The anterior tooth of the 

 dorsal carina may be located behind the orbital 

 margin and appear as part of the carapace series, 

 in which case there are four teeth on the carapace 

 and two on the rostrum (exclusive of tip) ; or, this 

 tooth may be located anterior to the orbital margin 

 and appear as part of the rostral series, in which 

 case there are three teeth on the rostrum and 

 three on the carapace. 



Color. — Ground color off white to light pink, 

 pubescence grayish to grayish yellow; dorsal 

 carina barred with white; appendages reddish 



MARINE DECAPOD CRUSTACEANS OF THE CAROLINAS 



35 



