360 Gastropoda. — Ctenobranchia. 



vissima : laluuni simplex, rectura axi parallelum, non sinuatum ; labium distinctum, 

 superne uniplicatum." — Long. 15, lat. 6 mm (Philh'1'i). 



Habit.: Stagno di Orbetello (Paxtanklli) ; Sicilia: Messina, port., Catania, 

 Termini (Akadas et BKxoril. 



5. Cerithium cylindratum Jeffb. Testa subcjiindiica. crassa, opaca, haud 

 nitens, pallide lutesccnti-fusca. striis rectis numerosis longitudiualibus lirisque spi- 

 ralibus, 4 in anfractu ultimo distincte reticulata, intersectionibus spiralibus; spira 

 sensim attenuata, apice obtuso bulboso: anfractus !(• — 12 compresso-rotundati. ulti- 

 mus ^'.3 longit. aequans, costis ad peripheriam evanescentibus, basi laevi lira una 

 infra peripheriam sculpti; sutura angusta. sed distincta; apertura irregulariter 

 rhomboidea, labro incrassato, crenulato, labio membranaceo, columelle Hexuosa. 

 — Long. 5, lat. 1,5 mm. 



Distrib.: Atlanticum. 



Habit. : Alger: Benzert, Rasel Amush, „Adventure Bank'" (.Teffrkys). 



Subg. Pirenella Gkay. Testa turrita; anfractus granulosi aut costis irre- 

 gularibus et varicibus muniti; apertura rotundata, labiuni simplex, labrum tenue, 

 sinuatum. 



m 6. C. conicum Blv. {C. momiUafum [Risso] Phil., C. sardorum Cantk.. 

 C. ci»fii(lafi(m Costa, ? C. pcforifdnum Cantk., CrrifJiiopsis ferri(;/iiicKS Bhis.i. Testa 

 elongato-conica, grisea, granulosa, longitudinaliter subplicata; anfractus numeroso, 

 subplanati, vix convexi, triseriatim granulosi, granulis plicas longitudinales effor- 

 mantibus, iiltimus basi subangulatus, infra angulum striis spiralibus tantiim sculptus: 

 apertura minima, ovata, canali lati, truncato. brevissimo, labro acuto, tenui, sub- 

 sinuato. — Long. IH — 20 min 



Habit. : Lacunarum et aquarum semisalsarum incola: Alger, Bona (Wein- 

 kauff); litora Galliae (Weixkauff), penins. Gien (Petit); Nizza (VfiKAXY); litora 

 pedemontana (Jeffrkys); Genova (PVieRANY); Sardinia (v. Martens); Napoli 

 (ScAccHi); Sicilia (Philippi), Messina, Faro, lacunae, Trapani, Angusta; Slalta 

 (Aradas et BenoitI: Tunis : sin. (Tabes (Dautzexi!EI<{;): Adria: Istria meridion., 

 Cherso, Lusisn (Stussich), Lussin picc. et grande. Ossero (Guuue), Zara Bre- 

 vilaqua (Sandri, Brusina), Cephalonia (v. Martens); mare Aegeum (Forbes); 

 Aegyptus (Fischei;). 



Subg. Cinctella M tks. Apex mamillatus : anfractus cingulis spiralibus et 

 sulcis imluicantilius hat- separantibus. 



m 7. C. trilineatum J^mi,. (Ccrifhiopsis frili)icaf<( Jevfr.). „Testa minuta, 

 subulato-turrita ; anfractibus plaiiis, cingulis tribus dbtusis, laevibus, interstitiis 

 lineolis longitudinalibus tenuissimis sculptis: canali brevissimo" (Philippi). - - 

 Long. 10, lat. 2,(i mm. 



Habit.: Alger. perrea. (Weinkauff); litora Galliae: saxa St. Gervasii, 

 prom. Couronne, aux Martigues (Petit): Sicilia : Ognina (Philippi), Magnisi (Mon- 

 tehosato) : Pantellaria ( Pmilippi) ; mare Aegeum (Fohhes). — Fossilis tertiaria. 



Bittium Leach (Ccritltiotioii Tin.). iV^ laitcculafus, aittc siihtruncatas; tciitu- 

 cula satis lonrfa; lolms opercuCujcr utrinque limbum uiidulatum formans; sipho rudi- 

 incntaris; testa parra, (loiajafa. aitfractihus. (jrantdosis. numcrosis. irrcciularitcr rari- 

 ms/s; apc.r rc(fulari.^; c((ii(ili.^ hrccis. vij- di.^fiiictiis. noii curratus; lahrum sacpc c.rtn^ 

 varicosum et dilafafiim, marijd (olumcllaris fiimjylcj:; operculnm subcircularr. nuclco 

 ccntrali, aiifracfihKs jhikIIo itnntcrosis. 



1. B. reticulatum B., D., D. (Sfromhifonnis rcticulafns da Costa, Ccrithium 

 reticuhittim V. et H., Murix scahcr Olivi, Ccrithium scahrum Blv., Wkff., C. lima 

 Bruc;., Phil., C. spina Tin., nec Partsch, Ceritkiopsis afra Dan. et S.). Testa 



