328 DR. O. BOETTGER ON NEW CLAUSILI^. [May 1, 



costulata, crista interiore umbilicali densius costulato-striata ; 

 costulis lanieUiforniibus anfr. ultimi prope aperturam sursum hie 

 illic bijidis. Lunella exacte dorsalis, magis minusve perspicua, sat 

 valida J clausilium apice acuta instructum. Alt. 12-14, lat. 

 2f-3 mm. ; alt. apert. 3, lat. 2| mm. 

 Hab. Sphakia, west of Crete (Spratt).^ 



A wonderful little shell, without attentive examination easily to be 

 confounded with C. lame/losa, Wagn., from Ragusa. But the well 

 developed apparatus claustralis lorbids to range it next to this 

 species, and prohibits also to put it into a series with the Syrian forms 

 C. prcBgracilis, Bttg., and C. albicosta, Bttg. The new species 

 seems to be nearly isolated between the Cretan Clausilice, where it 

 may perhaps have most affinities with the byzantina group, and, espe- 

 cially in the neck-form and costulation, with C. tenuicostata, Pfr., var. 

 heteroptyx, Bttg., in the form and position of the superior and 

 inferior lamellae with C. virginea, Pfr. ; but the nearly predorsal 

 lunella is quite peculiar to C. sublamellosa. 



9. Clausilia tenuicostata, Pfr. P. Z. S. 1864, p. 604. 



This species has been known till now from Selino and Lassos and 

 from the Gawdos island in South Crete {Spratt). It is also said to 

 occur ill the Bay of Mirabello {Pfeiffer) ; but I think it must have 

 been confused with another allied corrugated species. 



The specimens from Tripiti, south of Crete (Spratt), lying before 

 me, seem to be nearly typical, but are distinguished from Dr. 

 Pfeiflfer's diagnosis by the greater size, the more milk-blue colour, 

 and the straighter costulation. This form is moreover endowed 

 with a very deep-lying spiral lamella, whilst in the typical C. tenui- 

 costata the lamella spiralis approaches and passes a little the inner 

 end of the lamella supera. Alt. 17-19, lat. 3g-3f mm. ; alt. apert. 

 3|-4, lat. apert. 2|-2| mm. 



Another specimen, fiom Roumili, is a new variety, which I shall 

 name 



Var. HETEROPTYX, mihi. 



Typo simiUima, sed anfr. 12| sutura crenulata disjunctis, magis 



stride recteque coslulatis, ultimo costulis aliquantulum rarioribus, 



acutioribus, fere lamelliformibus, sed cceteris nan latioribus 



ornato. Lam. inferu supers valde approximata, validior, magis 



horizontaliter in mediam aperturam prosiliens, e bast intuenti 



callosa subspiraliter intrans. Alt. 19, lat. 3| mm.; alt. 



apert. 4, lat. apert. 3 mm. 



Hab. Roumili near Tarrha, south coast of Crete (Spratt). 



This curious shell seems in its whole exterior appearance to be 



nothing but a large form of C. tenuicostata, P.; but on studying with 



attention the inner plaits, one finds that the figure and position of 



the inferior lamella is remarkably different. But I cannot believe 



that this variety, being in its outer form, size, colour, and costulation 



identical with C. tenuicostata, should represent a really distinct 



species. 



