NINE SPECIES OF SQUILLID^. 7 



Tergum of fifth thoracic somite, on each side, produced to a small but acute 

 spine which is scarcely curved forwards. 



Terga of the second and third rounded-truncate and slightly turned at ends : 

 tergum of the last thoracic somite produced at each antero-lateral angle to an acute 

 triangular process. 



Tergum of fifth thoracic somite without longitudinal carinse ; of sixth, with a 

 pair of sublateral carinse ; of seventh and eighth, with a pair of subdorsal and a 

 pair of sublateral carince. 



Terga of the first to the fifth abdominal somites with three pairs of carinse, 

 one subdorsal, one sublateral, and one lateral : all but the first also with a more or 

 less distinct dorsal tubercle representing a dorsal carina : marginal carinas obsoles- 

 cent. 



All except the first of the obsolete marginal carinas end in spicules posteriorly, 

 as do also the lateral and sublateral cai'inae of the fifth tergum, and all the carinse 

 of the sixth. 



Telson about li times as broad as long, convex, scabrous, furnished on its disk 

 with a stout median longitudinally-convex roof-shaped carina, which terminates 

 posteriorly in a small sharp spinule. On each side of the carina is a curved row 

 of four or five coarse granules, converging posteriorly so as to form a lanceolate 

 figure, the point of which is formed by a minute tubercle beneath the tip of the 

 dorsal carina. Between this and the sublateral spines on each side are three similar 

 rows of granules: between these again and the antero-lateral angle, on each side, 

 are two or three isolated granules. On the base of each of the marginal spines is 

 a coarsely granulated ridge. The edges of the fairly salient marginal spines are 

 granulated, as also are the intervening spinules ; of which spinules there are from 

 two to six (typically yb?/>') between the two submedians, six between the submedian 

 and sublateral on each side, and one between the sublateral and lateral on each 

 side. The submedian spines probably end in an exceedingly deciduous movable 

 point. 



In full grown males the carinse of the sixth abdominal tergum are thickened ; 

 the granulated dorsal ridges of the marginal spines of the telson — including even 

 those of the smooth rudimentary basal pair — are developed into conspicuous 

 smooth oval bosses ; and the median carina of the telson is tliick and obtuse., with 

 the terminal spine minute and blunt. 



The ventral surface of the telson presents a short, coarsely and obsoletely 

 crenulated, post-anal ridge. * 



The great raptorial lim])s are armed with four or five spines or the inner 

 margin, and are slightly notched near the base of the outer margin. 



» Thoro ia a further description of the vonti-al surface of the telson, but the rough MS. is quite illegible owing to 

 erasures and contractions. 



