506 
BULLETIN OE THE UNITED STATES EISH COMMISSION. 
Systematic catalogue of the mollusks of Porto Rico — Continued. 
Family Strom bude. 
Subfamily Strombin.®. 
Genus Strombus Linnaeus. 
Strombus gigas Linnaeus. 
Strombus pugilis Lin nseus. 
Strombus costatus Gmelin. 
Strombus bituber culedus Lamarck. 
Strombus gallus Linnaeus. 
Family Triforid®. 
Genus Triforis Deshayes. 
Subgenus Triforis s. s. 
Triforis turristhomce Dillwyn. 
Triforis melanura C. B. Adams. 
Triforis intermedia C. B. Adams. 
Triforis sarncmce Dali. 
F am i 1 y Cerithiopsid m. 
Genus Setla A. Adams. 
Seila terebralis C. B. Adams. 
Genus Cerithiopsis Forbes & Hanley. 
Cerithiopsis crystallina Dali. 
Cerithiopsis mdchella J eff reys. 
Cerithiopsis pupa Dali & Simpson. 
Cerithiopsis subulata Montagu. 
Family Ceritiiiid®. 
Genus Cerithium Bruguiere. 
Cerithium algicola C. B. Adams. 
Cerithium uncinatum Gmelin. 
Cerithium atratum Born. 
Cerithium litteratum Born. 
Cerithium litteratum var. semiferrugi- 
neum Lamarck. 
Cerithium variabile C. B. Adams. 
Cerithium minimum Gmelin. 
Genus Pyrazus Montfort. 
Pyrazu s degeneratus Dali. 
Genus Bittium (Leach) Gray. 
Subgenus Diastoma Deshayes. 
Bittium varium Pfeiffer. 
Bittium cerithidioide Dali. 
Family Moduli dal 
Genus Modulus Gray. 
Modulus modulus Linnaeus. 
Modulus eaten id at us Philippi. 
Family Plaxaxitle. 
Genus Planaxis Lamarck. 
Planaxis nucleus Wood. 
Planaxis lineatus Da Costa. 
Family Vermetidae. 
Genus Vermioularia Lamarck. 
Vermicularia spirt da Philippi. 
Genus Petalooonchus Lea. 
Petal oconchus erectus Dali. 
Genus Bivonia Gray. 
Bivonia decussate/ Lamarck. 
Family Turritellidae. 
Genus Turritella Lamarck. 
Turritella variegata Linnaeus. 
Turritella exoleta Linnaeus. 
Family Litoriniiue. 
Genus Litorina Ferussac. 
Litorina ziczac Gmelin. 
Litorina ziczac var. lineata Lamarck 
Litorina tessellc/ta Philippi. 
Litorina angulifera Lamarck. 
Litorina columellaris d’Orbigny. 
Litorina guttata Philippi. 
Litorind mespilum Muh If eld. 
Genus Tectarius Valenciennes. 
Tectarius muricatus Linnaeus. 
Tectarius trochiformis Dillwyn. 
Family Litiopiiue. 
Genus Alaba A. Adams. 
A aba tervaricosa C. B. Adams. 
Family Solariidai;. 
Genus Solarium Lamarck. 
Solarium nobile Hanley. 
Solarium bisulcatum d’Orbigny. 
Solarium hrebsii Morch. 
Genus Torinia Gray. 
Torinia cylindrica Gmelin. 
Torinia cethiops Menke. 
Genus Omalaxis Deshayes. 
Omalaxis exquisita Dali & Simpson. 
