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Show 328 DR. o. BOETTGER O N N E W CLAUSILLE. [May 1, costulata, crista interiore umbilicali densius costulato-striata; costulis lamelliformibus anfr. ultimi prope aperturam sursum hie illic bifidis. Lunella exacte dorsalis, magis minusve perspicua, sat valida; clausilium apice acuto 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. lamellosa, Wagn., from Ragusa. But the well developed apparatus claustralis forbids to range it next to this species, and prohibits also to put it into a series with the Syrian forms C. pragracilis, Bttg., and C. albicosta, Bttg. The new species seems to be nearly isolated between the Cretan Clausilia, where it may perhaps have mo^t affinities with the byzantina group, and, especially in the neck-form and costulation, with C. tenuicostata, Pfr., var. heteroptyx, Bttg., in the form and position of the superior and inferior lamellse with C. virginea, Pfr.; but the nearly predorsal lunella is quite peculiar to C. sublameilosa. 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 in the Bay of Mirabello (Pfeifer) ; 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. Pfeiffer'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. tenuicostata the lamella spiralis approaches and passes a" little the inner end of the lamella supera. Alt. 17-19, lat. 3|-3| m m . ; alt. apert. 3f-4, lat. apert. 2§-2-£- m m. Another specimen, from Roumili, is a new variety, which I shall name Var. HETEROPTYX, mihi. Typo simillima, sed anfr. 121 sutura crenulata disjunctis, magis stride recteque costulatis, ultimo costulis aliquantulum rarioribus, acutioribus, fere lamelliformibus, sed cateris non latioribus ornato. Lam. infera supera valde approximata, validior, magis horizontaliter in mediant aperturam prosiliens, e basi intuenti callosa subspiraliter intrans. Alt. 19, lat. 3J 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. |
