169 

 Monoptygma Gray autt. 



91. Monoptygma (Careliopsis Mörch) styliformis Mörch. 



T. tenuis, lactea ad suturam Candida, gracillima styli- 

 formis; anfr. c. 9 planiusculi ad suturam leviter contracti 

 obliqui, lati, spiraliter subtilissime striati; sutura marginata; 

 anfr. primi 4 costulato-plicati ad suturam. Apertura sub- 

 rhombea elongata. Columella angulato-inflexa antice pro- 

 ducta; labio tenuissimo, labro simplice. Nucleus obliquus. 



Long. 4^10 mm.; diam. 9 / l0 mm. 



Hab. St. Thomas (A. H. Riise). 



Carelia Cumingii Pfr. quoad formam; Rissoa striata 

 quoad sculpturam. Monoptygma amoena A. Ad. Thes. 

 f. 21 an affinis? 



92. Monoptygma (Myonia) clathratula Mörch. 



T. alba vel etiam flava, elongato-clavata, obtecte per- 

 forata, spiraliter dense lirata; Striae incrementi expressae 

 unde interstitia lirarum punctato-cancellata; anfr. 5 — 6. 

 Apertura auriformis, plica columellari validissima torta 

 acuta postica. Nucleus nitidus, perpendiculariter instructus. 



Long, fere 4 mm. ; diam. testae 1 l / A mm. ; long. ap. 1 1 / H mm. 



Hab. St. Thomas (Riise, Krebs). 



Monoptygma speciosa A. Ad. Thes. f. 24 — 25 quoad 

 formam et sculpturam. 



Bullida e. 



Actaeon Mtf. (Tornatella Lam.). 



93. Actaeon Cumingii] A. Ad. Proc. Zool. S. 1854. p. 58. 

 Tornatella Cumingii Reeve Ic. 1865. f. 12. 

 Hab. Portorico (Krebs), Rio Janeiro (Capt. Martin). 



94. Actaeon exiguus Dkr. mss. 

 T. obtecte perforata, carnea, ovata; spira elevata fere 

 dimidiam testae longitudinis; anfr. ult. dimidium anticum 

 sulcatum, sulc. fundo punctatis; spira et dimid. post. anfr. 



