524 



EEPOET O.V THE ORDER STOMATOPODA—BIGELOW. vol.xvii. 



of about the usual size — a little more tliau half the lengtli of tlie car- 

 apace. The raptorial claws are rather short when folded, only reach- 

 iug- back as far as the angle on the side of the carapace. The carpus 

 has no spines, but is armed Avith a sliarp crest that ends distally in a 

 rounded angle. The outer edge of the dactylus describes a curve which 

 if slightly changed might becionie either a simple or a compound curve. 

 The rostrum is nearly as broad at the tip as it is at the base, t.m\ tbe 

 lateral and median cariuie are well marked. Tlie median carina of 



tlie carapace is bifurcated in front 

 but is only faintly marlced in this 

 region. The angle on each posterior 

 lobe is well marked. The ventral 

 si:>ines on the first exposed (fifth) tho- 

 racic segment are strong, sharp and 

 pointed obliquely forward, and there 

 is a low ridge running from each one 

 to the nearest marginal process. 

 There is a small projection on Mie 

 second segment in front of each lat- 

 eral lobe. The submedian carinie 

 are nowhere very prominent, but 

 the others on the abdomen become 

 ' more and more pronounced toward 

 the telson. The sixth segment has 

 a small spine on the same side in 



TELSON OF 8QUILLA ACULEATA. 



Mule. Two-thiril3 natural i 



-Anteru 



ir lateral angle and carin 

 I., im., sm. — Lateral, intermediate 



Bpines, each with a basal carina. 



Id., id., sd. — Lateral, intermediate 



denticles. 



front of the uropod. 



The long submedian and interme- 

 diate spines, curved like the horns 

 of a cow together with the thicken- 

 ings at the bases of the spines and 

 teeth, give the telson (fig. 10) a very striking appearance. There is a 

 separate elevation at the margin corresponding to each denticle and 

 siiine, and there is also a distinct pair of anterior lateral carinas. 

 The general surface ot the telson is unusually smooth, but the pits 

 are unusually well defined. They are arranged in about eight rows. 

 The ventral surface is perfectly smooth except for a corresponding 

 series of pits and a small carina on eac^h side running in a short way 

 from the extreme anterior lateral angle. "The denticles are all blunt. 

 The uropods present nothing remarkable except that the lobe on the 

 inner spine of the basal projection is a little nearer the base than 

 usual. The inner margin of the projection is bluntly serrated and the 

 second joint of the exopodite is about two thirds the length of the first 

 joint. The latter bears eight movable spines. 



8. empusa, Say, differs from this specimen in having wider eyes (0.043 

 times total length); the processes on the antennary segment acute; 

 two. small spines on the anterior edge of the carpus of the raptorial 



