532 BEPORT OX TEE OBDER STOMATOPODA—BIGELOTV. vol.xvii. 



and broadly T-shax)ed, especially in tlie female. The male has rounded 

 processes at the bases of the eyes, while iu the female they are acute. 

 The ophthalmic segment is emarginate in front. The next segment 

 is completely covered by the rostrum and bears a pair of acute spines. 

 The first three joints of the first antennte are longer than tbe carapace. 

 The second anteunai are about as long as the carapace, and the aiiten- 

 nary scales are three-fourths as long. The raptorial claw is so long 

 that when folded it extends as far back as the most posterior point of 

 the carapace. There are two short spines on the outer margin of the 

 carpus. The pectinations on the inner margin of the manus have an 

 undulating outline. The dactylus has six strong teeth. It is angled 

 near the articulation, but from the angle to the tip of the terminal 

 tooth its outer edge forms a simple curve. The appendages on the 

 three posterior pairs of thoracic legs are linear or narrowly spatulate. 



Size. — Length of the largest specimen, 10,5 cm. 



Locality. — There are but two specimens in the collection, both collected 

 by the Albatross. One, a male, was taken in 1885 at station 2378, in 

 the Gulf of Mexico, near the delta of the Mississippi (No. 9658, U.S. 

 N.M.). The other, a female, was taken in 1886 at station 2655, in the 

 Atlantic, north of Little Bahama Bank (No. 11543, U.S.N.M.). 



SQUILLA BIF0EMI8, B i g e 1 o w. 

 Plate XXI. 

 Squilla biformis, Bigelow, Johns Hopkins ITniv. Circ, 88, 1891. 



Diagnosis. — Eyes large, subtriangular or nearly T-shaped; dactylus 

 of the raptorial claw with six teeth; rostrum ovate, with median and 

 marginal carinte; carapace provided witli five well-marked carime, 

 anterior lateral angles produced into small acute spines, posterior 

 lobes angled at the sides; lateral spines of the first exposed thoracic 

 segment strong, well curved forward, aiid acnte, lateral ])rocesses of 

 the next two segments obliquely truncated and acute; eight prominent 

 carinse on the first five abdominal segments; telson with a crest, a short 

 ventral keel produced into a stout spine directed backward, and the 

 general surface marked by many symmetrically curved lines of shallow 

 pits, the dorsal surface in males elevated into a continuous smooth 

 thickening around the entire free border; in females no elevations at 

 the bases of the denticles and very small carintie at the bases of the 

 six marginal spines; five to seven submedian denticles, 15 to 19 inter- 

 mediate, and one lateral, all small. 



General description. — This is a large species, about 17 cm. long. The 

 carapace (pi. xxi) equals in length the exposed thoracic segments and 

 the telson measured from its base to the tip of the submedian spines, 

 and is somewhat less than half as long as the first six abdominal seg- 

 ments. The body widens gradually from the posterior margin of the 



