Ilevision der IVly/.heliiiiiitlieii. ^■a 1 



SUßFAMILIA U. SIPHONOSTOMAE. 

 Os circiilare vel obsolete bilabiatum in apice haustelli protrac- 

 tilis. — Anus dorsalis supra acetabulum situs. — Sexus discretus aut 

 aiidrogyiu). 



" Sexus discretus. 

 XIII. MALACOBDELLA BLAINVILLE. Charact. aucto. 



Hiriido Müller. — Phylline Oken. — Xenistum Blanchard. — Branchio- 



bdella Gay. 

 Corpus ellipticum v. subliiieare, depressum, haud annulatum. 

 Caput corpore continuum, apice emarginatum. Os circulare in apice 

 haustelli brevis, protractilis, terminalis. Occlli nulli. Acetabulum ba- 

 silare sessile. Sexus discretus. Tractus intestinalis unicruris, ano 

 stipatus; anus dorsalis supra acetabulum. — Ovipara. — Mollus- 

 corum marinorum ectoparasita. 



Mas et femina habitu conformes. — Nee spermatozoidea nee ovuIa organis 

 propriis sunt excepta, sed libere in corporis parenchymate nidulant, nee 

 emittuntur per aperturam propriam, imo potius ex tota corporis super- 

 ficie eniergunt, aperturis exitu eorum ortis serius obliterantibus (Blan- 

 chard de Maiacobdeiia Valcnciennaei). 



Res profecto nimio plus insolita ac, me sciente, in toto regno animali 

 sui generis uniea ! 



1. Maiacobdeiia grossa BLAINVILLE. — Syst. Helm. I. 445. adde: 



Oersted: De Region, marin. 1844. 80. — Leidy: in Proceed. Aead. 

 Philad. V. (1851) 209 et VIIl. (18S6) 45. 



Habita culum. Cytherea exsoleta: juxta cardinem, intra 



branchias, in Dania (Müller). — Cyprina islandica (Kroyer) ad 



corpus ejusdem speciei in profunditate 11— oo orgyiarum, in fretu 



Öresund, aestate (Oersted). — Venus mercenaria — V. prae- 



p«rc«.- ad palliuin , solitarie, frequens, Philadelphiae (Leidy). 



Specimina a cl. Leidy descripta 2'" — 1", rarius 1 Vs" longa, Va'" — 5'", 

 rarius 7'" lata. 



2. Maiacobdeiia Valencienmiei BLANCHARD. — Syst. Helm. I. 445. 

 adde: 



Milve Edwards: in Acad. de Paris, seance du 2 juin 1845 et Rev. zool. 

 1845. 216. — Guerin Meneville: ibid. 248. — Blanchard: Voyage 

 enSicile, 3. partie, 66 et in Annal. des sc. nat. 3. ser. VIII. 142 et XII. 

 267—276 (anatom.) Tab. V. 1-5. 



H a b i t a c u I u m. Mya truncata : sub pallio , Majo (B 1 a i n- 

 ville), prope La Manche (Blanchard). 



