178 MESSES. J. C. MEIiYILL AND E. STANDEBT ON 



ornamentation very similar, but differs in form, being more 

 elongate and quite smooth and plain to the apex. Pilsbry* 

 queries MicrotJieca as a probable subgenus of Teinostoma, Ad., 

 but our strong opinion is that it should be separated generically. 

 In Teinostoma the callosity entirely covers the umbilicus. We 

 should, indeed, consider MicrotJieca nearer Ot/clostrema, Marryat. 



The type, M. crenellifera, to which allusion has just been made, 

 was originally described by Adams as a species of Isanda, Ad., 

 with which it possesses a certain amount of conchological affinity ; 

 but until the anatomy of these minute molluscs be more dili- 

 gently studied, the compilation of special monographs is useless, 

 and no arrangement can be other than purely tentative. 



The species before us is, however, much nearer i!f. crenellifera, 

 Ad., than Isanda coronata. Ad., which last we have received from 

 the Papuan region, though it does not occur in Dr. Haddon's 

 present collection. We have also obtained it from shell-sand 

 collected a few years ago by Mr. Arnold Umfreville Henn, at 

 Magnetic Island, Queensland, where it is very Abundant. 



Microtheca crenellifera occurring, as just pointed out, both in 

 Japan and Bombay, will no doubt be found in intermediate 

 stations, but it has hitherto occurred almost singly, and is very 

 scarce in European collections. It is five-whorled, globose, 

 white, shining, smooth save for one spiral costulate crenulation 

 below the sutures, which are much impressed, and for the 

 crenate callosity round the umbilicus, which has its counterpart 

 in M. Acidalia. 



Of this new species two examples, quite perfect and precisely 

 similar, occurred, which we think worthy of one of the epithets 

 formerly bestowed on Aphrodite. 



Stomatiid^. 



221. Stomatella Maeiei, Cr. 



Station 13, Mer ; Station 5, Boydoug Cays. 



222. Stomatella sulcieeea, Lam. 

 Station 13, Mer. 



223. &ENA STEIATULA, A. Ad. 



Station 2, Warrior Island ; Station 8, Albany Pass. 

 * Tryon, Man. Conch, x. pp. 16, 106. 



