SOUTH AFRICAN MARINE MOLLTJSKS. 189 



MODIOLA CAPENSIS Krauss. 



Cat. No. 167, U.S.N.M., one specimen collected by William Stimp- 

 son on the North Pacific Exploring Expedition at Simons Bay. Cat. 

 No. 43184, U.S.N.M., three specimens from the Cape of Good Hope. 

 In addition to these, there are three lots in the collection of the 

 United States National Museum, all from Port Alfred, as follows: 

 Cat. No. 186918, two and one-half specimens (Coll. No. 288); Cat. 

 No. 249843, two specimens (Coll. No. 1115); Cat. No. 249845, one 

 specimen (Coll. No. 1117). 



MODIOLA AURICULATA Krauss. 



Cat. No. 227813, U.S.N.M., contains three specimens of this species 

 from Port Alfred (Coll. No. 908). Cat. No. 249840, U.S.N.M., con- 

 tains another specimen from the same place (Coll. No. 1112). 



MODIOLA LIGNEA Reeve. 



Cat. No. 186919, U.S.N.M., one specimen from Port Alfred (Coll. 

 No. 289). 



Genus CRENELLA Brown. 



CRENELLA STRIATISSIMA Sowerby. 



Three lots of this species are in the collection of the United States 

 National Museum, all from Port Alfred, as follows: Cat. No. 187183, 

 two valves (Coll. No. 734) ; Cat. No. 227820, two valves (Coll. No. 

 915); Cat. No. 251062, a young specimen (Coll. No. 1579). 



CRENELLA ALFREDENSIS, new species. 

 Plate 41, fig. 1; plate 49, fig. 1. 



Shell small, milk white, of very regular oval outline, the outer 

 surface marked by numerous, very fine, radiating threads and rather 

 strong incremental lines. 



The type and another valve, Cat. No. 251006, U.S.N.M., come 

 from Port Alfred (Coll. No. 1523). It measures: Altitude, 3.2 mm.; 

 length, 2.1 mm. 



This species agrees with CreneUa striatissima in size, but differs 

 markedly from it in outline, stratissima having a mytiloid shape, 

 while the present species is practically a perfect oval in outline. 



Genus MODIOLARIA Beck. 



MODIOLARIA CUNEATA Gould. 



Plate 42, figs. 5, 6. 



Modiolaria cuneata Gould, Proc. Boat. Soc. Nat. Hist., vol. 8, p. 38, 1861. 



Shell moderately large, cream yellow, considerably inflated. 

 Umbones prominent, extending to the anterior limit of the shell. 

 Dorsal edge short, posterior dorsal edge sloping abruptly, curving 



