18 c. BOVALLIUS, NOTES ON THE PTERYGOCERA AUENAKlA, SLABBER. 



bristles, 3 — 4 in eacli bundle, the last or lowest one con- 

 taining 8—10 bristles. 



The iscldum is as usually small, quadrangular, with only 

 a single bundle of bristles in the lower posterior angle. The 

 meros has its lower margin convex with a coiiple of small 

 bristles; its upper surface is applied almost exclusively to the 

 articulation wiht the carpus, and is sligthly convex. The car- 

 pus is long and ovate; it carries on the hinder side 12 — 15 

 transverse rows (Pl. II, fig. 16) of tactile bristles of the same 

 structure as the corresponding ones of the first pair. Bet- 

 ween these are seen long bristles of a singular structure (Pl. 

 III, fig. 47), of which I cannot even conjecture the function. 

 They are somewhat broad at the base, attenuated towards the 

 middle, on their upper half very closely ciliated or, more 

 properly, clothed with very short, delicate spines or bristles, 

 radiating in all directions. At the point the cilia become 

 a little louger, which gives the whole bristle an appearance 

 of being terminated with a tonguelike expansion. Just at the 

 point there is a very minute opening leading into the inner 

 cavity of the bristle, which is filled with granular matter. 

 They secrete a clear, hyaliue, oily liquor, which adheres in 

 small dröps to the longer surrounding hairs. Above these 

 two forms of bristles there are also some shorter, straight 

 and smooth ones of the same shape as those on the upper 

 or forcmost side (Pl. III, fig. 36). The propus is about a 

 third shorter than the carpus, broader anteriorly and rounded 

 at its extremity; the lower side straight, the upper one cur- 

 ved. Near the front-margin it carries long, double pointed 

 tactile bristles in transverse rows and of the same appearance 

 as those on the first pair of the gnathopoda (Pl. Ill, fig. 48). 

 Among these there are, especially on the loAver side, several 

 shorter, on one side only finely serrated bristles (Pl. III, fig. 

 37). The dactylus is of a very different form (Pl. I, fig. 9 a), 

 very small, broad at the base, deeply divided, with the inner 

 sides of the claw-like halves strongly excavated, giving the 

 whole the appearance of a chela; the both side-parts are reci- 

 procally immoveable; between them there are a number of 

 minute fine bristles. 



The first pair of pereiopoda (Pl. II, fig. 10) articulates 

 with the upper end of the coxa, without any perceivable basal- 

 point. Close to its point of attachment the rather long ped- 



