218 



longer and identical in structure. The 2nd segment of pereopods III is 

 very slightly longer but narrower than the 2nd segment of pereopods II; 

 the 5th and 6th segments taper distally, which is not characteristic of all 

 the remaining species of the family Scinidae; the 4th segment is slightly 

 shorter than the 2nd but is longer than the 5th; the 5th segment in turn 

 is slightly longer than the thin 6th segment; the claw is small, weak, and 

 slightly curved. 

 182 In the structure of pereopods V, S. c he lata differs sharply from all 



the known species of Scina in the presence of a subchela formed by the 

 5th and 6th segments, although a tendency toward the formation of such 

 a subchela is present in S. typhlops. The 2nd segment of pereopods V is 

 only slightly shorter than the remaining segments together; its anterior 

 margin is armed with long curved denticles while the posterior margin 

 is finely denticulate; the distal process is longer than the 3rd segment; 

 the rod-shaped, slightly curved 4th segment is only slightly shorter than 

 the 2nd segment; the 5th and 6th segments are strong and short; the 5th 

 segment is deeply denticulate in the proximal part of the anterior mar- 

 gin and sensory setae occur at the base of these denticles; the relatively 

 thin and slightly curved 6th segment is insignificantly shorter than the 

 5th, and may be bent at its anterior margin to form a well-developed 

 subchela; the claw is short and strong. Pereopods VI are very insignifi- 

 cantly shorter than pereopods V; the 2nd segment tapers distally and is 

 only slightly longer than the rod-shaped 4th segment; the almost mutu- 

 ally equal 5th and 6th segments together are slightly shorter than the 4th, 

 and each of these segments tapers distally; the claw is small and slightly 

 curved. Pereopods VII are relatively well developed, as in other species 

 of the latifrons group. They have roughly the same proportions as in 

 pereopods VI but are shorter; the broadly oval 2nd segment is slightly 

 longer than the 4th, which is almost equal to the 5th and 6th segments 

 together; the claw is small and curved. 



The basipodites of the uropods are longer than the endopodites; 

 the exopodites are relatively well developed. In uropods I the anterior 

 margin of the basipodite bears strong setae while the inner margin of the 

 endopodite is finely denticulate. In uropods II the posterior margin of 

 the basipodite is slightly denticulate. Uropods III have a smooth posterior 

 margin and a sharp bend opposite the attachment of the outer ramus. The 

 telson is oblong-oval and 2/5 the length of the basipodite of uropods III; 

 its tip is rounded. 



Notes: Scina chelata differs sharply from all species of the genus 

 Scina in the well-developed subchela of pereopods V, the distally taper- 

 ing tips of the segments of pereopods III, IV, and VI, and in the well- 

 developed and basally broad inner lobes of the maxillipeds. However, in 

 many other features (well-developed maxillae, shape of the outer lobes of 



