8 ^If. E. A. Siniih on }foUuscafi-om the 



Very like A', dor salts, but the valves arc more equally 

 divided dt)wn the middle by the central groove, so that the 

 anterifir and posterior portions are about equal. In A'. do7'- 

 Sd/is they are decidedly unequal, the posterior side being 

 conspicuously larger. This is clearly seen within the valves, 

 being indicated by the position of the strengthening rib. 



The sculpture on the anterior areas and the protoplaxcs 

 are similar in both forms. I am inclined to think that the 

 latter will be found to be somewhat variable in form. 



Anatina andamanica, sp. n. 



Testa tonuissiraa, subpiriformis, antice lato rotundata, postico obtuse 

 roslrata, iiia^qiiilateralis, a?quivalvis, mediocritcr coiivexa, pi'llu- 

 cido-all)ida, lincis ineronienti striata ; iimbones ])roniincntc's, 

 coiitigui, circitor in ]^ loiigitudinis collocati ; ])ajiina inti'ina nitida, 

 vix niargaritacca ; sinus pallii profundc rotundatus ; fulcra liga- 

 menti ]>arva. 



Longit, 18 mm., alt. 14, diam. 10. 



Hab. Lat. 11° 32' N., long. 9.2° 4G' E., off west of Anda- 

 mans, 194 fath. 



Shorter and rounder than many of the known forms. The 

 rostrate end exhibits slight traces of a periostracum. 



Euciroa eburnea (Wood-Mason & Alcock) . 



Verticordia (Eiich-oa) ehnrnea, AVood-Mason & Alcocli, Ann. it Mag. 



Nat. Hist. 1891, vol. viii. p. 447, fig. 14. 

 Verticordia optima, Sowerby, I'roc. Malac. Soc. vol. i. p. oO, pi. v. 



lig. 3 ; op. cil. p. 82, as V. elurnea, "\V.-M. & Al. 



Hab. Andaman Sea, 188-220 fath., and Stations 229 and 

 232, off Travancore coast, in 360-130 fath. 



Very similar to E. elcyautissima, Dall, from the Antilles, 

 and V. pacijira, Dall, fioin the Hawaiian Islands. Arc they 

 sufficiently distinct to be regarded as diffei'cnt species, or are 

 they not merely variations of one widely distributed form ? 



It is curious to note that tlie localities of the three species 

 lie between 11° and 24" north of the equator, at depths 

 ranging from 1S8 to 7oG fathoms, with a bottom-temperature 

 of 3S°, 40'"", and 55°. 



The size and number of the granules rcFcrrcd to by 

 Dr. Dall* as distinguishing this species from E. eburnea are 

 variable, for in one specimen from the Andamans they are 

 quite as fine and as numerous as in one example of E. pacifca 

 in the Museum collection. 



• rioc. U.S. Nat. Mils. 1801, v.l .wii. p. CS'.K 



