548 



REPORT ON THE ORDER STOMATOPOBA—BIGELOW. voi..xvii. 



aecompaiiyiug figures with our form sliows so many differences that the 



two must be distinct. 



Our hirva, Squilla {Alima) quadridens, is in the first phice nuich 



smaller than Alima hldens at the stage with three lateral teeth on the 



dactylus, the later being an inch in length while the length of the 



former is but l.G cm. 

 Tlien in our form the carapace is relatively shorter and narrower, 



making with the rostrum less than two-fifths of the total length of the 



body measured along the median 

 line. The rostrum does not ex- 

 tend beyond the shafts of the first 

 antennae and does not equal half 

 the length of the rest of the cara- 

 pace. The anterior lateral angles 

 are not so- prolonged, and the i)0s- 

 terior lateral si)ines reach only so 

 far as the boundary between the 

 second and third of the four jios- 

 terior thoracic segments, which 

 are left exposed by a deep incision 

 in the posterior margin of the cara- 

 pace. There is a single secondary 

 spine at the base of each posterior 

 lateral process and three or four 

 minute ones on the side of the car- 

 apace in front of the mouth. The 

 hind body is more elongated than 

 in Alima hidens and comprises 

 more- than three-fifths of the total 

 length from the tip of the rostrum, 

 but, as in that species, all of the 

 iwsterior lateral angles of the first 

 five abdominal somites end in acute 

 spines, and there are two submed- 

 ian spines on the sixth. The shape 

 of the tclson is very similar to that 

 of the other species, but it has a 

 different number of secondary den- 

 ticles, there being on each side 

 fifteen submedian, eight to nine 



nn.wn with the , •.■imera iLKidaXS. 1 4. 1 



mtermedmte, and no lateral ones, 

 while in A. hidens they are 20=t , 1--13, 0. The basal prolongation of the 

 uropod shows beneath the larval skin the characteristic form of the 

 adult, including traces of the acute teeth on the inner side. The raptorial 

 claw is more slender than in A. hidens, and the manus bears two equally 



FIRST STAGE OP ADULT FORM OF SQUILLA 

 QUADRIDENS. 



