44 



Description. — The tube attached by its base to shells or stone, and much 

 distorted in growth. 



But two specimens are known, of the only species of this genus, and they 

 are entirely too much distorted in appearance to furnish reliable characters. 

 They exhibit, however, a close relationship to Brechites, etc., from which they 

 may be distinguished by their adherence to foreign bodies. This character is 

 sufficient to justify the separation made by Dr. Gray, under the name of Hum- 

 phreyia; and, until we are better acquainted with these shells, it is as well to 

 allow the genus to rest on it alone. Dr. Gray has attempted more, and in- 

 curred thereby the criticism in Reeve's Monograph, which we have already 

 quoted. 



Species of G astrochsenidse,.* 



GASTROCH.ENA. 



1. G. agglutinans, Deshayes, sp. 



Chsena agglutinans, Deshayes, Proc. Zool. Soc. Lond. p. 330, 1854. 

 Gastrochaena agglutinans, H. and A. Adams, Genera, ii. p. 335, 1856. 



Description. — "G. vagina minima, elongato-clavata, postice valde attenuata, 

 cortice valde et irregulariter transversim plicato, corpora aliena agglutinante. 

 Testa, elongato-paulo latiore, extus ut in Solenibus bipartite, parte altera sub- 

 plana, arcuatim striata, altera longitudinaliter tenuissime striata ; latere antico 

 brevissimo, abrupte truncato, cucullato, angulo acuto circumscripto, radiatim 

 tenue lirato, liris subgranosis ; impressione musculari postica paulo post me- 

 diana, minima; sinu pallii profundo, acutissimo." — Deshayes. 



Hab. — Zebu, Philippines. Coll. Cuming. 



Remarks. — This shell is distinguished from G. mu m i a by its agglutinated 

 tube, the division of the surface of the valve into two parts, and their peculiar 

 striation. G. grandis has, like this species, an agglutinated tube, but its 

 valves are carinate and sulcate, and differently formed. 



2. G. grandis, Deshayes, sp. 



Chaena grandis, Deshayes, Proc. Zool. Soc. Lond. p. 330, 1854. 

 Gastrochaena grandis, H. and A. Adams, Genera, ii. p. 335, 1856. 



Description. — " G. vagina elongato-clavata, regulari, recta, transversim 

 rugata, postice attenuata, sabuletis in cortice agglutinante. Testa elongato- 

 angustil, hiantissima, postice latiore spathulata, ad latus anticum sensim 

 attenuata ; latere antico brevissimo, subito truncato et angulo acuto distincto, 

 in medio valde carinato vel cristato, radiatim inaequaliter sulcato, sulcis 

 inaequalibus novem ad decern, quinque majoribus denticulo acuto terminatis ; 

 cardine lineari, simplici ; impressione musculari postica in medio longitudinis 

 posita ; sinu pallii profundo, acutissimo." — Deshayes. 



Hab. — Zebu, Philippine Islands. Coll. Cuming. 



3. G. m u m i a ,* Spengler. 



Gastrochaena mumia, Spengler, Nov. Act. Sc. Soc. ii. p. 174, f. 1 — 7, 1783. 

 " Journ. Nat. Hist. Soc. Copenh. iii. p. 20, 

 t. 2, f. 1, la. 

 Favanne, Conch, t. 5, f. k, 1780. 

 Deshayes, Traite Elem. p. 32, t. 2, 1843— '50. 

 Morch, Catalogue, 1853. 



H. and A. Adams, Genera, iii. t. xci. f. 1, la, 1855. 

 Chaena mumia, Retzius, Nov. Test. Gen. p. 19, 1788. 



Schumacher, Essai d'un Nov. Syst. p. 94, 1817. 

 Woodward, Manual, t. 23, f. 16, 1854. 

 Chaena tessellata, Gray, Zool. Proc. p. 315, 1858. 



* Those species marked with a star are contained in the collection of the Academy of 

 Natural Sciences of Philadelphia. 



