510 PROCEEDINGS OF THE NATIONAL MUSEUM vol.99 



heterocheles Vanhoffen. Three species appear to belong in Synay- 

 seudes. They are S. minutus Miller from Hawaii, S. heterocheles 

 (Vanhoffen) from Cape Verde Islands, and S, intumescens, new 

 species, from California. 



SYNAPSEUDES INTUMESCENS, new species 

 FlQTJBES 41, 42 



Holotype. — Female with partially developed oostegites; length 2.0 

 rnm,, width at widest part of third peraeon somite 0.4 mm. 



Allotype. — Length 1.6 mm., width 0.4 mm. 



Figured paratype. — Female ; length l.G mm., width 0.6 mm. 



Diagnosis. — Eyes lateral, bulging slightly. Rostrum bifurcated. 

 Lateral borders of pleon somites 2 and 3 extending somewhat pos- 

 teriorly and having truncate apex beset with tuberculations and a seta. 

 Pleotelson with acutely pointed apex, above which is a narrow, cone- 

 shaped, setif erous papilla, lateral and anterior to which are two widely 

 conical setif erous papillae. Inner branch of uropods composed of 

 four segments, outer branch two- jointed. Inner margin of first 

 antenna with conspicuous spines. Second antenna having five seg- 

 ments. Last joint of mandibular palp bearing two ciliated setae. 



Character of hody. — Entire animal appears elongated and is more 

 attenuated posteriorly than anteriorly. Integument thick, heavily 

 calcified, chalky white in color. Tips of gnathopods black. 



Carapace. — Carapace longer than wide; eyes bulging and with a 

 lateral convexity immediately posterior to them. Rostrum bifurcated 

 and margined with sharp tubercles. Two elevated circular swellings 

 are located one on each side of midline posterior to eyes and are fol- 

 lowed by a wider pair of perhaps less elevated swellings. Posterior 

 border of carapace widely convex. A single long seta located on each 

 side of carapace posterior to eyes. 



Peraeon. — First somite fused with head to form carapace. Second 

 and third somites similar and with a seta and three lateral elevations 

 on each side of midline; margin of first lateral elevation extending 

 the length of second somite and possessing tuberculations at anterior 

 angle ; second lateral elevation of second somite similar to first lateral 

 elevation and with tubercles and a seta at anterior angle and tubercles 

 on posterior angle ; third lateral elevation (marginal) of second somite 

 longer and larger than second lateral elevation of that somite and pos- 

 sessing tubercles on anterior and posterior border and a seta at its 

 posterolateral angle. Somites 5 and 6 similar, having first lateral 

 elevation margin that does not extend entire length of somite, stopping 

 prior to reaching posterior border; second lateral elevation lacking; 

 third lateral elevation similar to those of prior somites except that 

 those of the fifth and sixth somites possess two setae. Sixth somite 



