148 



DR. T. DAVIDSON OX EECENT BRACHIOPODA. 



FiK. 15. 



ILah. Foimd by Herr M. A. Scliulgin alone or in groups on Posklonia ; off Sardinia, 

 Villafranca, and off the islands of Hyeres. 



Obs. I have never seen this small shell. Schulgin 

 gives two figures which seem to me rather dissimilar ; 

 we will, however, take the illustration in his pi. viii. 

 fig. 5 as his type, as it differs in several particulars 

 from Cistella neapoUtana. Schulgin describes and illus- 

 trates the shell and its animal with much care and minute- 

 ness in the memoir above quoted ; but his description 

 agrees so nearly witli that of Cistella neapolitana, pub- 

 lislied one year before by Mr. Shipley, that I must 

 refer the reader to Herr Schulgin's memoir, and content 

 myself by reproducing in PL XXII. fig. 26 one of the 

 author's most instructive illustrations. Schulgin seems to 

 have discovered the presence of some sense-organs situated 

 in the body-wall just behind the chief or suboesophageal 

 nerve-ganglion ; but this requires confirmation, for A. E. Muscular arrangement in Cistella 

 Shipley saw notliing of them in the allied species he studied Sowalevskii (after ScMgin). 

 in Naples. The arrangement of the muscles in C. Ko- rtc^.", adjuvator ventralis ; rfv.i', di- 

 loalevskii is quite similar, as might be expected, to that varicator ventralis ; oc.6, ocelu- 

 described by Mr. Shipley in Cistella neapolitana. 



sor biceps ; ad.d, adjuvator dor- 

 salis ; </v.d, divaricator dor- 



salis. 



86. Cistella Schkammi, Crosse, sp. (Plate XXIII. figs. 3 & 4.) 



Argiope Sclirammi, Crosse & Fischer, Journal dc Concli. vol. xiv. p. 269, pi. viii. fig. 6, 1806. 

 Cistella Schrammi, Dall, Amer. Journ. of Conch, vol. vi. p. 146, 1871, aud Proe. Acad. Nat. 

 Sci. Philadelphia, 1873, p. 194. 



Shell very small, transversely subpentagoual, wider than long, indented in front ; 

 hinge-line straight, as long as the greatest breadth of the shell, cardinal extremity 

 prolonged and acutely angular. Dorsal valve very gently convex, with eight rounded 

 ribs, and a very broad median depression between the two central pairs. Ventral valve 

 rather deeper than the dorsal valve, with a similar number of corresponding ribs, and 

 wide depressions between the central ones ; beak bent backwards, almost straight, area 

 triangular, foramen large and incomplete, margined anteriorly by the umbo, and by two 

 small lateral deltidial plates. Colour yellowish or pale orange, sometimes tinted with 

 red. Length 1 line, lu'eadth 1^ line. 



Sab. Dredged, associated with Cistella Barrettiana (C. antiUariim, Crosse), off Guada- 

 loupe, at a depth of from 200 to 250 metres, by the Italian brig ' Icilia.' 



Obs. Thanks to the kindness of M. Crosse, I have been able to examine and draw his 

 type. I have also a rather larger specimen from Tortugas. The matei-ial at hand has, 

 however, been so small that I can say nothing j)ositive with respect to the specific 

 claims of Cistella Schrammi. 



