﻿FTSTULAXA. 



Gonus FISTFLAXA. Lnmarrk. 

 MiiI.I.USCCM VERMIFOIJ.MK, AKKXIfdl.C.M, TrBIGKRI'M. 



Vidcidm liheroi, clongatce, late ef ainjulariter 

 li'hinh's; cardine lineari, edentulo. Tuba recta, 

 circidaris, antice attenuata, vemus terminnm 

 jioxticHm crescens, termiuo j'i'r iliMtim convcxuni 

 /ifrforatum clnuso. 



Syn. Gastroclimia. Sj)eiigIor (Adams). 

 MoLl.usK VKRMiFOKM, iiiliabitiug sand, tubo-forming. 

 Valves free, elong-ated, broadly and angularly 

 gaping ; binge linear, toothless. Tube straight, 

 circnlar, anteriorly attonnated, increasing to- 

 wards the posterior end ; end closet! by a convex 

 perforated disc. 

 Adopting the nomenclature by which this genns 

 is generally known, we should say that the FiV/». 

 laaiT resemble the Gantrochivna; in the most esiicntial 

 characters. Both have free gaping valves enclosed 

 in a tube closed at the anterior end. The main dif- 

 ference is that the former bury their tubes in the 

 sand, only the small siphoiial end being visible, but 

 are unattached, while the latter are boring mollnsca, 

 and attach their tubes to the various substances in 

 which they make their crypts. 



The two or three species hitherto known are found 

 at low water in Singapore, PhUippiucs, and other 

 islands of the Eastern seas. 



Species 1. (Fig. (i, h, ^fus. Brit.) 

 FiSTDLANA CLATA. Fis. tcstil oUorigd, rectuhculd, late 

 Mujulatim hianii, ad tcnnhmm jwsticum late 

 truncatd, margine dorsali recto ; umhondms fere 

 terminalihus ; latere antico hrcvi, suhquadrato, 

 acute angulato, margine denticulato. Tuhd, elon- 

 gatd, hevigald, concentrice tenuiter striata. 



TiiK ii.rn Kisu'L.iNA. Shell oblong, rather straight, 

 broadly angularly gaping, broadly truncated at 

 the pfisterior end, dorsal margin straight ; um- 

 boes nearly terminal ; anterior side short, rather 

 square, sharply angular, margin denticulated. 

 Tube elongated, smooth, concentrically linely 

 striated. 



Lamarck. Anim. sans Vert. 



Gastrocliivna mninia. Sjienglor. 



Rah. Singapore. 



Species 2. (Fig. a, h, c, Mns. Brit.) 



FiSTULANA AGCLUTINANS. Fi^. /rslii aiigintti.^yi )i,d, 

 turtud; hialu ainjulatissuuo. Tid,d laidllus 

 arena-ipie grana agijlaiiiia iitc 



The AGGLUTINATING FiSTULAXA. Shell very narrow, 

 tortuous; hiatus very angular. Tube agglu- 

 tinating small stimcs and grains of sand. 



I)i:snAYi:s. Pmc. Zool. Soc. 



llab. Philippines, &c. 



Species :J. (Fig. a, b, c. Mus. Brit.) 



Fist 



liii)!, latis, 

 latti, latere 

 concentrice. 



;a GRANIUS. Fis. te.M mlnd;^ 



poslich rotiimli' iiijlatis; hiain ri.c i: 



aii.tico brcvissiiiiu, arciiato. Tah 



riigis annulatd. 

 The large Fistulana. Shell with large broad 



valves, roundly inflated posteriorly ; hiatus 



scarcely angular, anterior side very short, arched. 



Tube concentrically annulated with wrinkles. 

 Deshaies. Proc. Zool. Soc. 

 Eah. Philippines, itc. 



