63 



inner margin, 2 or 3 on the outer, 3 other ones stand on the upper surface not far from the 

 outer margin and a 4 th spine occurs in the middle near the inner margin; the lower side is 

 unarmed, except a spine on the distal border near the inner margin and a smaller one more 

 outward. 



The truncate or slightly concave, anterior margin of the epistome is unarmed; the 

 epistome is smooth, though there is a longitudinal furrow in the middle on the posterior third 

 or fourth part. Exopod of external maxillipeds rudimentary, appearing as a small blunt process 

 on the outer side of the base. In a specimen, long 23 mm., the ischium-joint is o,S mm. long, 

 the merus 1,2 mm., the carpus 0,56 mm., the penultimate joint 0,62 mm., the conical dactylus 

 is 0,8 mm. long, (inclusive the terminal spine that measures 0,06 mm.); the joints decrease 

 gradually in width, the ischium being 0,51 mm. broad, the merus 0,44111111., the carpus 0,4 mm., 

 the propodus 0,3 mm. and the dactylus 0,24 mm. at its base. The slender spines into which the 

 lateral margins of the last thoracic sternum are produced backward, are slightly curved inward. 



The thoracic legs are smooth, glabrous, quite unarmed; these legs that terminate all in 

 a slender, pointed dactylus (also the 5 th ), decrease in length from the 2 nd to the last. A genital 

 aperture was not observed, neither on the coxae of the 3 rd nor on those of the 5* pair of Ws. 



The abdominal appendages of the 2 nd — 5 th somites show all the same form and characters 

 and resemble those of the " Natant stage" of Boas (Studier over Decapodernes Slaegtskabsforhold, 

 Kobenhavn, 1880, Tab. V, fig. 184, 184a). All are biramous, consisting of 2 foliaceous plates, 

 not very broad, fringed with ciliated hairs and articulated with a stalk which is about as lono- 

 as or somewhat shorter than the exopod. The inner branch, a little longer and a little less 

 broad than the outer, carries, at l / i of its length from the base, a styliform, slender Appendix 

 interna, that slightly tapers and that is provided at the tip with some coupling-hooks. In a 

 specimen, long 23 mm., the outer branch of the pleopods of the 2 nd somite is 1,3 mm. long 

 and 0,48 mm. broad, somewhat behind the middle, and narrowing to the tip; the endopod is 

 1,4 mm. long, 0,4 mm. broad in the middle, also narrowing to the tip, while the Appendix 

 interna is 0,6 mm. long and 0,1 mm. broad proximally. The measurements of the pleopods of 

 the 5 th somite in this specimen are as follows: outer branch 1,48 mm. long and 0,54 mm. 

 broad, inner branch 1,58 mm. long and 0,42 mm. broad, Appendix interna o, 6 mm. long and 

 0,11 mm. broad at the base. 



Some specimens show a yellowish, other ones a tawny colour. The white lateral bands 

 on the carapace are sometimes distinct, in most specimens, however, not, while the converging 

 bands of the W are not discernible. The abdominal terga are often marked on either side 

 with a brownish C-shaped fleck on a pale ground-colour, with the concavity turned outward, 

 while the posterior margin often presents traces of the dark and pale bands, that are charac- 

 teristic of Panul. versico/or. The antennae and antennulae, like also the legs, are marked with 

 the longitudinal bands and stripes that occur in this species. 



General distribution: The "natant"-stage of Panul. vcrsicolor, puerulus spiniger, 

 has hitherto been observed at Amboina (Ortmann) and at Christmas Island (Calman). 



