POTTS— POLTCHJiTA. 349 



the dead-white elytra in this species contrasting witli those of S. boa encrusted with 

 brownish grains. There are slight differences in the heads, but the resemblance of the 

 ventral setse is marked, the same three types occurring in both species. The possession 

 of an upper spinose group, consisting only of simple setse, separates these species from 

 others in which there are either both simple and compound spinose forms {S. variabilis, 

 &c.), or where the spinose group is absent altogether {S. zeylanica). The development 

 of the spinose group in S. orientalis is not so great as in ^S*. boa, only a single seta 

 generally occurring. 



31. Sthenelais calcarea, sp. n. (Plate 19. fig. 24.) 



Measurements. Two fragments measuring 57 mm. in length, but still incomplete, and 

 3'5 mm. in breadtli. 



Head provided with two pairs of eyes, both very small, anterior placed underneath 

 on anterior border. Ctenidia at side of tentacle small. 



Elytra (fig. 24) save for first, which is oval, reniform, provided with cilia which are 

 moderately long on the outer border, very short on the posterior edge, alternation of 

 shorter and longer taking place in a curiously irregular way. The surface covered with 

 small equal tubercles, flat-topped, with chitinous rims thickened on one side. In 

 anterior region of elytron calcareous concretions cover surface. Grains of all sizes 

 occurring in connection with tubercles already mentioned, their curious granular nature 

 indicating that they are true concretions. First elytron alone not possessing grains, 

 though the tubercles more thickly placed there than in any other of the series. 



Parapodia rather resembling those in S. variabilis in character. Upper division 

 of ventral setse comprising spinose individuals both simple and compound. 



Locality. Goidu, Gorfurfehendu Atoll, Maldives. 



This curious species is characterised by the chalky appearance of the elytra, due to the 

 small calcareous concretions which cover them. It must be noted that these encrusting 

 particles are not foreign, like the grains of sand and foraminifera which the genus 

 Psammolyce affects, but appear to je formed in situ. 



32. Sthenelais variabilis, sp. n. (Plate 19, figs, 22, 23 ; Plate 21. fig. 63.) 

 Head with two pairs of eyes, both anteriorly placed, foremost and smaller quite lateral. 



Palps very long and slender, contrasting with shorter structures in S. orientalis. Head 

 closely surrounded by succeeding segments, the first three having revolved almost at 

 ri»ht ansrles. 



Elytra close, overlapping, reniform in shape, except first which is oval and of a thin 

 translucent nature. Only in one specimen from the Maldives (Hulule, Male, 25 fms.) 

 were any markings preserved on their surface ; in this example a spot of white pigment 

 over the elytrophore, and further inward a brown crescent surroimding a white spot. 

 Male specimens, first elytron beset with a large, thick anterior margin. In succeeding 

 elytra, margin cdiate, but degree of ciliation differing greatly in the various forms. In 

 some, cilia on greater part of border, and even developed on surface (var, hirsuta, fig. 23); 



SECOND SERIES. — ZOOLOGY, VOL. XIII. 46 



