1894. PROCEEDINGS OF THE NATIONAL MUSEUM. 541 



white, witli a few symmetrically placed black spots. (See pi. xxii.) 

 The same number of spots is not always present. 



Size. — The largest of the two specimens is 4.1 cm. in length. 



Locality. — Two females were collected by me in Bimini Harbor, Baha- 

 mas, where they were fonnd burrowing in the calcareous sand. (jS"©. 

 18495, U.S.N.M.). 



SQUILLA RUGOSA, B i g e 1 o w. 



SquiUa riKjom, Bigelo-sv. .lolius Hopkins I'niv. Cirr., 10(i, p. 102, 18it3. 



Diagnosis. — A SquiUa having large triangular eyes with oblique cor- 

 nea; long raptorial claws, their dactyli armed with six teeth; a sub- 

 triangular truncated rostrum, slightly raised 

 at the margin; five longitudinal carina^ upon 

 the carapace, the median and intermediate 

 being interrui)ted by the cervical suture, and 

 the median one not bifurcate in front; the an- 

 terior lateral angles of the carapace produced 

 into acute spines, and the posterior angles 

 rounded; six carina^ on each of the exjjosed 

 thoracic segments, the lateral jirocess of the 

 first of these segments being lanceolate and 

 acute, with the second and third rounded in 

 front and produced backward into an acute telson of scjuili a rugosa. 



s])ine ; eight carina' on the first five abdominal Ab.,u; tvv„e namrai s.ze. 



segments, all the abdominal carina' ending in 



spines except the submedian of the first four segments and the interme- 

 diate on the first two; three to four teeth on the posterior margin of 

 the fifth and sixth abdominal segments between the submedian and 

 intermediate spines; ten prominent cariime on the dorsal surface of the 

 telson on each side of the crest, which ends in a spine, six marginal 

 spines, and on each side five submedian teeth, ten to twelve intermedi- 

 ate, and one lateral one; the basal prolongation of the uropod with 

 eight to twelve long teeth on its inner margin, and a rounded lobe on 

 the outer side of the inner spine. 



General description. — Tlu^ first imin^ession one receives on handling 

 a specimen of this species is the marked prominence and sharpness of 

 all its carinie and spines. The general proportions of the body are 

 very similar to those of 8. qnadridens. The length of the carapace is 

 very nearly equal to one-ciuarter of the total length of the body and to 

 the greatest width of the abdomen. The greatest width of the cara- 

 pace is equal to three-fourths its length. The telson is very nearly as 

 long as it is broad at its base. 



It is in the uroi>od, the telson and the adjoining segments that we 

 find the most striking peculiarities of this species. The most promi- 

 nent of these is the sculpturing on the dorsal surface of the telson 

 (fig. 23), The median longitudinal crest is high and narrow and ends 

 behind in a very sharp spine ])oiuting directly backward. There is a 



