﻿GASTROCH/EXA.— Plate III. 



Dkshayes. Proc. Zool. Soc. 18")4, p. oiii. 



Hah. P 



This may be only a smooth variety of the Gadr 

 chwiin lanevula ; but I have not seen the valves. 



Species 18. (Fig. a, h. Mus. Sowerbj-.) 

 (jAstroch.iona lagenula. Gas. testa, parva, arcuatd, 

 tenui, angiistd; area, posticd in tahtdas divisu, 

 inter tahii.las sulcata. Tuba irrerjulariter bulb!- 

 formi, agtjlutinanfi, quasi articulatim dirisi'i. 

 The fla:k Gasteoch^ena. Shell small, arched, thin, 

 narrow ; posterior area divided in tablets, with 

 grooves between the tablets. Tube irregularly 

 Imlbifonn, agglutinating, divided into quasi- 

 articulafcions. 

 Lamarck. Anim. j--. Yert. 

 Hah. Cej-lon, Arracan. 



Id Adams's Genera, this and the preceding species 

 are included in the genus Guettera. The valves of 

 a. lagenula, however, are those of a true Gas- 

 trocJiana, while those of Guettera have the charac- 

 teristics of true Teredines. 



Species 19. (Mus. Brit.) 

 GASTROCHi)NA TEiTNCATA. Oas. testa rugosd, solidius- 

 culd, epidermide fused indutd ; latere an tico s^ibat- 



tenuato, umbonibus gibbosis; latere postico angulato, 

 laic truncato ; area dorsali depressd ; hiatu laio, 

 chjugato ; dente cardinali magnu. 



The TRUNCATED Gastroch.«na. Shell rugose, rather 

 solid, covered with a brown epidermis ; anterior 

 side rather attenuated, nmbones gibbons ; pos- 

 terior side angular, broadly truncated ; dorsal 

 area depressed ; hiatus broad, elongated ; cardi- 

 nal tooth large. 



SowERBT. Proc. Zool. Soc. 1834, p. 21. 



Hob. Bay of Panama. 



Species 20. (Fig. a. Mus. Brit. Fig. b, Plate IV., 

 Mus. Sowerby.) 



GASTROCHJiKA cuNEiFOEMis. Gas. testd cwieifoniii, 

 teiminsculd, antice attenuatd, ante umbones sub- 

 produdd, acuminata ; latere posticolato, versus ter- 

 minnm obUqite subacumiitafo ; hiutn nadcrat'; 

 eloiigato. 



The WEDGE-SHAPED Gastrouh^na. Shell wedge- 

 shaped, rather thin, anteriorly attenuated, a 

 little produced in front of the umbones, acu- 

 minated ; ])osterior side broad, obliquely rather 

 acuminated, towards the end. Hiatus moder- 

 ately long. 



Spenoler. Guerin, Mag. Nat. Hist. 



Hab. Isl. Zebu, Philippines. 



