151 



8. Cyclostoma globosum, Benson MSS. C. testa umbilicata, 



globoso-conicu, temii, suhtUissime striatula, diaphana, non ni- 



tente, cimiamomea, maculis opacis, albidis, sub/asciatim dispo- 



sitis ornata ; spira conica, apice jieracuta ; anfract. 6, siiperis 



vix convexis, ultimo globoso, carina basali subtili, filari ; aper- 



tura parum obliqua, ovali ; perist. simplice, marjjinibus fere 



contiguis, dextro perarcuato, cohimellari medio dilatuto, pa- 



tente. — Operc. tenuissimum, corneo-lutescens, extus concavius- 



culum. 



Long. 8, diam. 5 mill. ; apert. 4 mill, longa, 3^ lata. 



These three species belong to a generic type in the family Ci/clo- 



stomacea, for which I propose the name Omjikalofrojns, because all 



known species have a keel-hke ridge round the umbilicus. The 



species belonging to it are the same which I referred previously to 



the doubtful genus Hydrocena, except the typical species of that 



genus, Cyclostoma Cattai-oense, Pfr. {Hydrocena Sir/cii, Parr.), which, 



by its amphibious nature and by some differences in the structure of 



the animal itself, seems to belong to another family. The genus may 



be characterized by the following phrase : testa perforata vel anguste 



umbilicata, globoso-turbinata vel turrita, circa perforationem cari- 



nata. Apertura ovalis. Peristoma disjunctum, rectum, vel expan- 



sum. Operculum tenue, corneum, paucispirale. 



Its known species are the following: — 1. O. aui-antiaca, Desh. 

 (Cyclost. Belangeri, Pfr.) ; 2. O. erosa, Quoy & Gaim. ; 3. O. ru- 

 bens, Quoy & Gaim.; 4. O. multilirata, Pfr.; 5. O. globosa, Bens.; 

 6. O. dubia, Pfr. ; 7- O. expansilabris, Pfr. ; 8. O. hieroglyphica, 

 Fe'r. ; 9. O. pupoides, Anton.; 10. O. rosea, Gould; M. O. tere- 

 bralis, Gould; 12. O. vallata, Gould; 13. 10. scitula, Gould. 



13. Descriptions of Nineteen New Species of Land 

 Shells, collected by M. Bourcier, Consul-General, 

 Quito. By Dr. L. Pfeiffer. 



1. Cyclostoma (Cyclophorxjs) Bourcieri, Pfr. C. testa 

 late umbilicata, orbiculata, conoidea, solida, subtiliter striata et 

 lineis elevatis spiralibus, plus minusve confertis sculpta, epider- 

 mide fusco-olivacea vestita ; spira breviter conoidea, vertice nudo, 

 subpapillato ; anfract. 4^-5, convexis, lente accrescentibus , ul- 

 timo terete, antics subdescendente ; apertura obliqua, subangulato- 

 circulari, intus margaritacea ; perist. . simplice, recto, anfractui 

 penultimo breviter adnata. — Operc. tenuissimum, corneum, arcti- 

 spirale, extus concavum, intus nitidum, medio umbonatum. 



Diam. maj. 19, mm. 15, alt. 9 mill. 

 Hab. prope Mindo, reipubhcse JEquatoris. 



2. Cyclostoma heliciniforme, Pfr. C testa obtecte umbili- 

 cata, conoideo-globosa, solidula, striatula, parum nitente, virenti- 

 cornea; spira parvula, conoidea, acutiuscula; anfract. 6, con- 

 vexiusculis, ultimo inflato, antice subascend^nte, pone columetlam 



