APPENDIX. 351 



Brown, II. C. B. t. 40, /. 24.— A. Borealis, Phil. N. C. 2, p. 58, 

 As. 1. 1,/. 11.— A. cor. Loven.—A. A. Br. Mol. 2, p. 401, t. 30,/. 7. 

 — Sow. T/fc. 2, js. 780, £. 167,/. 20. Subcordate-subtriangular, sub- 

 ovate, solid, inequilateral, with a fibrous silky chestnut cuticle, 

 smooth, except at the acute and prominent beaks, arcuated at the 

 simple ventral margin, which rises rather abruptly posteriorly ; dorsal 

 edges sloping, straight ; lunule very profound, lanceolate or ovate- 

 lanceolate ; ligament very large; hinge-margin very broad. If. 

 N. Europe. Inadequately described at p. 89. 



On Cyclas (p. 89). Consult the list of Pisidia (inequilateral 

 Cyclades) in the J. Conch. 2 ; the Ann. Lye. N. York, 5, Bost. J. 4, 6, 

 Pr. Bost. 3, 4, Zeit. Mai. 1845, 1850, Krausa' ' Sud-Afrikanischen 

 Mollusken,' Morelet's ' Testacea Novissima,' &c. 



Cyclas cornea, p. 89, t. 9, f. 15 ... C. lacustris, p. 89, 1. 14, f. 43 ... 

 C. obtusalis, p. 90, t. 14, f. 47 ... C.fontinalis, p. 90, t. 14, f. 15 ... 

 C. similis, p. 90, t. 13, f. 11 ... C. striatina, p. 90, t. 13, f. 12 ... 

 C. Sarratoga, p. 90, t. 13, f. 16 ... C. ?titida, p. 90, t. 14, f. 46 ... 

 C. appendiculata, p. 91, t. 19, f. 42 ... C. cinerea, p. 91, t. 14, f. 44 

 ... C. partumeia, p. 91, t. 14, f. 48 ... C. elegans, p. 91, t. 14, f. 49. 



On Cyrena (p. 92). Consult the monograph by Deshayes (British 

 Museum Catalogue) ; see, too, Proc. Pliilad. 3, Carpenter's Mazatlan 

 Shells, and Mousson's Coquilles, &c, en Orient. 



Cyrena orientalis, p. 92, t. 13, f. 15 ... C. violacea, p. 92, t. 13, 

 f. 13 ... C. Woodiana, p. 92, t. 14, f. 58 ... C. rotundata, p. 93, 1. 14, 

 f. 55 ... C. Carolinensis, p. 93, t. 14, f. 56 ... C. Bengalensis, p. 93, 

 t. 13, f. 14 ... C. turgida, p. 93, t. 14, f. 50 ... C. Cyprinoides, p. 93, 

 t. 14, f. 54 ... C. Vanikorensis, p. 94, 1. 14, f. 59 ... C. oblonga, p. 94, 

 t. 14, f. 53 ... C. Sumatrensis, p. 94, 1. 15, f . 1 ... C. Australis, p. 94, 

 t. 14, f. 57. 



Cyrena tenebrosa (t. 14, f. 2), Hinds, An. Nat. (1842), 10, p. 81 ; 

 Sidp. p. 66, t. 21, /. 7. — Batissa t. Desh. Ve?ier. p. 238. Oval, 

 transverse, inequilateral, thick, subventricose, rather glossy, dirty 

 yellowish brown ; posterior third with regular deep rather distant 

 sulci, elsewhere smooth or nearly so ; ventral edge convex, rising 

 abruptly in front ; anterior slope a little retuse, the surface behind it 

 a little flattened ; umbones much eroded ; ligament large, very pro- 

 minent ; inside whitish, purple-stained in front and ventrally ; primary 

 teeth strong ; lateral teeth crenated, short, the hinder one approxi- 

 mate. 2... 3. Feejee Isles. 



Cyrena Philippinarum (t. 14, f. 60), Hani. Z. P. 1844, p. 159. 

 Very large, compressed, obovate, very inequilateral, heavy, with fold- 

 like concentric sulci behind ; cuticle glossy, brownish olive when 

 adult, bright grass-green when young ; ventral edge only slightly con- 

 vex ; ligamental edge somewhat sloping, forming an obtuse angle with 



