.366 



variegata, pellucida, sulco ab umbonibus parvuUs ad basin de- 

 currente insigni. 

 Hab. Port Lincoln. 



Testą minima, vix 2 lin. longa, tenuissima, pellucens, lineis rufis 

 undulatis et reticulatis pieta, antice et postice tenuiter costulata. 

 Pagina interna margaritacea ; margo cardiiiis tenuissime crenulatus. 



25. Lanistina concinna. 



L. testą parvula, fragili, ovata, modice convexa, flava lineis non- 

 nullis preBsertim apices versus undulatis et angulatis fuscis 

 pieta, epidermide viridi pellucente vestita, suleis ab apicibus 

 parvulis ineurvis utroque latere radiantibus instrueta. 



Hab. Ad Philippinarum iusulam Zeba (^Cumitig). 



Species 7 lin. longa, 3^ lin. altą, 2| lin. crassa, antice angustata, 

 postice dilatata, pauUulum compressa. Margo dorsalis seąualiter 

 parumque arcuatus, basalis psene rectilineus. Extremitas antica an- 

 gusta arcuata, costulis nonnuUis signata, ultra apices minutes incur- 

 vos prominens. Costulae planse marginėm versus ex parte furcillatse 

 in latere postico 20-24 numerantur ; interstitia earum latitudinem 

 non excedunt. 



DiiFert haec species a Modiola strigata, Hanl. (Proc. Zool. Soc. 

 1844), testą minus convexa, postice magis dilatata, umbonibus haud 

 tumidis costulisque latioribus planis partim dichotomis. 



26. Crenella bulla. 



C. testą fragili, oblique elliptica, bullata, alba, striis tenerrimis 

 confertissimis ab umbonibus radiantibus sub vitro tantum eog- 

 noscentibus undique instrueta, epidermide tenuissima pallida 

 obducta ; umbonibus ineurvis gracilibus anticis ; ligamento 

 brevi ; toto margine intus subtilifer creiiulato. 

 Hab. Ad Philippinarum insulam Luzon. 



Testą tenuissima, perfragilis, pellucida, totą alba. 5 lin. longa, 

 4 lin. altą, 4 lin. crassa, subglobosa vel bullata, ambitum fere exacte 

 ellipticum refert, si modo angulum obtusum, quem margo cardinalis 

 posticus cum latere postico format, uou respicis. 



November 25, 1856. 



J. S. Gaskoin, Esq., F.L.S., in the Chair. 



Mr. Tegetmeier brougbt before the notice of the Members living 

 specimens and preparations illustrating the very remarkable pecu- 

 liarities existing in the skuUs of the feather-crested rariety of the 

 domestic Fowl, now known as Polish. In these birds, the anterior 

 portion of the frontai bone is expanded into a large spherical tube- 

 rosity or cyst, which is partly osseous and partly membranous ; the 



