group in Sergestes-^ the chela is not fully six times as long as broad, with a longitudinal row 

 of thin spines on the subproximal part of the lower side near the margin ; the hand is a little 

 more than half as long again as the movable finger. Third pair of legs much longer and much 

 more slender than first pair; the chela in an adult female is about fourteen times as long as 

 broad, and the hand is scarcely three times as long as the movable finger. 



The petasma (figs. <\e — 4^) is very characteristic. Pars externa is not small but peculiarly 

 reduced; its lamina {latn.) is more than twice as long as broad, with a very obtuse angle of 

 the outer margin somewhat before its middle ; processus uncifer [pti.) is less than half as long 

 as the lamina but broad, only twice as long as broad, tapering towards the broadly rounded 

 end, which has no hook. Processus ventralis {pv.) is very long, divided to rather near the base 

 into two branches, the longest situated behind the other, and covering its major part when the 

 petasma is seen from behind (figs. 4^ and 4/); the posterior branch has its distal half divided 

 again into two branches, the outer somewhat slender, straight and terminating in a hook, the 

 inner somewhat longer, rather curved and considerably broader than the other, and its distal 

 part is expanded outwards forming a plate which has one extremely large hook and a small 

 hook at the outer margin; the anterior branch of processus ventralis is moderately slender, 

 but nearly its distal fourth is expanded essentially and very strongly outwards, constituting a 

 transverse plate which has a row of small hooks at the inner margin and a few similar hooks 

 at the terminal margin. Lobus armatus {hx.) projects far beyond the insertion of the processus 

 ventralis and about from the middle of the capitulum; it is directed wholly outwards, thus 

 nearly vertical on the main direction of pars media; it is broad, rather long and tapers con- 

 siderably beyond its middle to the obtuse end; an extremely large hook is seen on its distal 

 margin somewhat from the end, and five smaller hooks near the oblique terminal margin. 

 Along the inner margin of the sub-proximal half of the capitulum is found a somewhat feeble 

 expansion with about six hooks near the margin (fig. 4^), and it terminates in a rudiment of 

 a lobe; the whole expansion may perhaps be considered as a kind of lobus accessorius. Lobus 

 terminalis (//.) is directed forwards, straight, somewhat short and slender, with several minute 

 hooks near the inner margin and at the end; at its base projects outwards and a little forwards 

 a triangle with the end obtuse and equipped with two hooks, and this triangle I consider as 

 the lobus connectens {Ic). Lobus inermis does not exist. Pars astringens (fig. 4^, a.) is broad, 

 moderately long, with a long row of coupling hooks. 



Length of a male 23 mm., of a female 24 mm. 



Remarks. — Calman's figures of the petasma taken from one of Borradaile's types 

 of Stc. maldivensis show that the "Siboga" specimens belong to the species described by 

 BoRRADAiLE. But it seems to me somewhat doubtful that Sic. (Aphareocaris) elegans Calm, is 

 the young male of Sic. maldivensis, because the petasma, according to Calman's figures, must 

 be so different from that in Sic. maldivensis that I cannot think it to be a not fully developed 

 organ of the latter species. The differences between Sic. maldivensis and the following species 

 are pointed out later on. 



Distribution. — Borr.\daile writes: "Specimens were taken throughout the Maldives 

 and in Cargados Carajos in various depths". 



