NATURAL SCIENCES OP PHILADELPHIA. 477 



Fistulana mumia, Catlow, Conch. Nomenc. p. 2, 1845. 



Jay, Catalogue, 4th ed. p. 8, 1850. 

 Fistulana clava, Lamarck, Anim. Sans Vert. v. p. 435, 1818. 



" (Desh. edit.) Anim. Sans. Vert. vi. p. 30, 1835. 



Cuvier, Regne Anim. 1st edit. ii. p. 494, 1817. 



" " " (Audouin's edit.) t. 116, f. 1, a, b, c. 



Sowerby, Genera, No. 27, f. 15. 

 Bosc, Hist. Nat. des Coq. ii. p. 204, 1824. 

 Blainville, Malacol. t. 81, f. 3, 1825. 

 Deshayes, Encyc. Meth. Vers. ii. p. 140, 1830. 

 Wyatt, Conch, t. 33, f. 5, 1838. 

 Reeve, Conch. Syst. t. 19, 1843. 

 Hanley, Desc. Cat. p. 3, t. 11, f. 5, 1842. 

 Teredo clava, Gmelin, 3748, 1790. 



Dillwyn, Desc. Cat. ii. p. 1090, 1817. 

 Description. "G. vagina tereti clavata, recta, tenuissima, fragili ; testae 

 valvis elongatis, antice contortis, uncinatis, regulariter striato-plicatis." 

 Deshayes. 



Hab. India, Philippine Islands. 



This is the well known type of the old genus Fistulana. Very excellent 

 figures of it are given in the works of Deshayes, Cuvier, Blainville and 

 Sowerby, quoted above. 



G. (Chsena) annulata, Gray, B. M., Hab. Mozambique, Mauritius, is 

 mentioned in the Zool. Proc. Lond. for 1858, but without description. 



ROCELLARIA. 



Considerable diversity of form exists among the species of this genus, and 

 their separation into groups would probably facilitate their study ; this we are 

 unfortunately not able to do in a very perfect manner, in consequence of the 

 extreme paucity of some of the descriptions. We have separated a subgenus 

 Spengleria, and propose to divide the remaining species into two groups. 



1st. Those whose shells are short and ovate. Ex R. dubia, hians, etc. 



2d. Those possessing elongate-cuneiform shells. Ex R. apert iss im a, etc. 



It has been proposed to create a separate genus or subgenus for those 

 species possessing a large spathulate hinge lamina, and it is not at all impro- 

 bable that future researches will show the necessity for such division. It will 

 be seen that in a majority of the species the anterior hiatus is very long, 

 equalling the entire, or nearly the whole length, of the shell. There are 

 marked exceptions to this, however, in several species, the hiatus in R. 

 h u m i 1 i s , for instance, scarcely reaching to the middle of the shell. The 

 umbones are always placed near the anterior margin, and they are sometimes 

 terminal. Differences also occur in the width, length, prominence and color 

 of the ligament, in the contour of the margins, in the relative proportions of 

 the sides anterior and posterior to the beaks, the form of the hiatus, character 

 of the striation, the thickness of the valves, the size of the spathulate hinge 

 lamina, (which is generally minute or obsolete,) and in the form of the interior 

 impression. 



a. Valves short, ovate. 

 1. R. b r e v i s , Sowerby, sp. 



Gastrochrena brevis, Sowerby, Zool. Proc. Lond. p. 21, 1834. 

 Th. Miiller, Syn. Test. Viv. p. 335, 1836. 

 Hanley, Desc. Cat. p. 11, 1842. 

 Catlow, Conch. Nomenc. p. 2, 1845. 

 Rocellaria brevis, H. and A. Adams, Genera, ii. p. 336, 1856. 

 Description. " R. testa breviter ovata, tenui, pellucida, striata, striis exi- 

 lissimis ; longitudine lateris antici octavum partim testae sequante. Long. 0"8. 

 lat. 0*5, alt. 0"5, poll." Sowerby. 



1861.] 



