1894. PROCEEDINGS OF THE NATIONAL MUSEUM. 533 



carapace to the second abdominal segment, then keeps about the same 

 width back to the telson. 



The rostrum is as broad as it is h)ng ami is broadly rouuded iu out- 

 line anteriorly. It extends over the first auteunary segment. The 

 median and marginal carime are well marked, the former extending, 

 liowever, only along the first half of the rostrum. The length of the 

 carapace equals nearly tlie posterior width and is about twice the width 

 between the anterior lateral angles. All five carina' are well marked. 

 The median is bifurcated fore and aft, and it and the intermediate are 

 interrupted by the transverse suture. There is a median tubercle on 

 the posterior margin. The anterior lateral angles are rounded except 

 at the point of termination of the intermediate carina, where a sharp 

 spine arises abruptly. The posterior lateral lobes are obtusely angled 

 laterally. 



The exposed thoracic segments are provided with well-marked sub- 

 median and intermediate carinas The ventral spine of the first exposed 

 segment is obliquely fiattened and acuminate, the lateral one is fiat- 

 tened dorso-veutrally, curved forward, and acute. The lateral margins 

 of the next two segments are obliquely truncated and acute. 



Th« first five abdomimvl segments have submedian, intermediate, 

 lateral, and marginal dorsal carinas The sixth has all but the latter, 

 and the second, third, fourth, and fifth 

 have double median tubercles. The mar- 

 ginal and lateral cariuie of the first ab- 

 dominal somite end ])osteriorly in spines. 

 This is true of all but tlie submedian in 

 the second, third, and fourrh, and in the 

 fifth and sixth they all end in spines. 



The telson is a little shorter than broad 

 and generally rounded in outline. There 

 are six relatively small marginal spines 

 which in the female (fig. 20) are continued 

 into very slightly elevated carinre. The 

 anterior lateral carin;e are distinct, but 

 not prolonged into spines. The snbme- ti^. -'o- 



dian spines are divergent. Between each telson of squili.a niFORM.s. 



submedian spine and the shallow median *"''"^'" "'^""^ ""^^^'^' 



sinus there are five or seven blunt teeth. 



Between a submedian and an intermediate there are 15 or 17, and there 

 is one between the intermediate and lateral spines. The crest is rather 

 broad and terminates in a very small spine. On the ventral surface there 

 is a short prominent keel, which is drawn out into a stout and sharp 

 spine, pointed directly backward. Both dorsal and ventral surfaces are 

 marked by numerous symmetrical curved lines of shallow pits, and the 

 dorsal surface is slightly roughened between them. In the adult male 

 (pi. XXI) the crest is thickened and whole margin of the telson is very 

 much swollen on the dorsal side, so that all the carina^ run together. 



