;J(j2 tJstracoaa. 



extremitas posterior emarpinata . dimidio inferiore dentibus pluribus brevilius ar- 

 mata; valvae centro summopere gibbosae, superticie valde scabra, rugosa, tuber- 

 culata. 



D i s t r 1 b. : Oceanus iudicus, insulae Admiralitatis. 



Habit. : Messina. portus (Seguenza); Tenedos (Williamson, Brady). La- 

 takif''. l^)eyrontli iHkadvi. — Fossil. : Pliocen.. quaternaria Siciliae. 



40. Cythere fistulosa Bkady [Cyihcrcis Jistulusa Baikd, Ci/therris uncinatn 

 Baird?). Valvae fere quadrilaterae elongatae; extremitas anterior paullo magis 

 rotundata quam posterior, dentibus 7 — 8 parvis, extremitas posterior dentibus 

 5 — 6 inajoribus armata; inargines, dorsalis et ventralis, fere recti ; superlicies 

 granulosa, cristis 4 elevatis rectis, ad margiuem earum foraminibus parvis per- 

 tusis notata. 



Distrib. : Ad insulas Philippinas. 



Habit. : Messina ; Tenedos; SjTa, Ehodus, Alexandrette, .Taflfa, Port Said, 

 (Brady, -Messageries"). 



m 41. C. senticosa Brady (C//thcrcis soiticosa Baikd, C. hi/strix Eeiss). 

 Yalvae comphinatae. ovatae; extremitas anterior posteriore latior rotundata; 

 margo dorsalis extremitatem versus posteriorem declivis, ventralis fere rectus; 

 superticies valde scabra , rugosa et ubique , praesertim ad margines , laciniis for- 

 tibus spinosis obsita. — Fossilis in stratis tertiariis. 



Habit. : Tenedos (Williamson, Bkady), Besika Bay, Constantinopoli, Port 

 Said (Bkady. ..Messageries"). 



*C. flavida 0. F. MiLL. Testa oblonga, angusta, extrcmitas anterior posteriore 

 acutior; Jaevis, nitens, pallide flavo-cornea, transhicens; margo inferior fere rectus, superior 

 arcuatus. 



Distrib. : Mare Anghcum; Pontus (Czerniawski). 



* C. variabilis Baikd. Testa ovahs , extremitas antica posteriore valde angustior, 

 glauca, sine jiilis; alba fasciis duabus nigris transversis , aut caruea, marginibus virides- 

 centibus, maculata aut unicolor, aut obscure brunnea vel nigrescens. 



Distrib. : Mare Anghcum; Pontus (Czekniawski). 



*C. aurantia Baikd. Testa subrcniformis, margine superiore prominente, infra 

 leviter sinuato, postica extremitas antcriore hitior, laevis, ghauca, laete aurantia. Pcrparva. 



Distrib.: Mare Anghcum; Pontus (Czekniaavski). 



*C. nigrescens Baihd. Testa gibbose ovata, antica extremitas rotundata, angustior 

 quam gibbosa acute terminata posterior; laevis, absque pilis , sordide nigra, translucens, 

 corpore nigrescente. 



Distrib.: Mare Anghcum; Pontus (Czerniawski). 



Cytheridea Bosquet (Ci/prideis Jones). Valvae (a latere visac) subtrian- 

 (jnlarcs aiit triauijidaritcr ovatae, in paiic tertia anteriorc altissimac, crassac, coni- 

 pactae, foveolatac, papHlosac aiit concentrice rugosae; manjo cardinaJis dcxtcr scric 

 fuhcrcidorum parvoritm pracditus ; macidac Jucidac i transvcrsa scric ordinatac, ccntro 

 valvarum proxima; anfcnnae I. robusfissimac, plcrumque 5-articulatac, s^jinis fortibus; 

 articidus idtimus angustus elongatus; antennae II. 4-articidatae ; setae urticantes longae 

 gracilcs biarficidafac ; mandibidac magnae denfibus numcrosis, palpus 3-articidatus 

 appcndicc f/ranchiali jirarditiis ; pedcs in <£ ct ^ dissimdes, 2)cs dcxfcr 6 p^rimi paris 

 prchriisUis fhrfis, drxfrr II. iKiris 6 pcrdchdis ct rudimetdaris. 



1. C. torosa J^rady (Candona, postea Ci/pridcis forosa Jones, Ci/fhcridca 

 liforalis Brady, C. tenera , syriaca Brady passim). Valvae $ (a latere visae) 

 obh»ngae subovatae ; longitudo vix altitudinem dupham aequans ; margo dorsalis 

 arcuatus , ante medium altissimus, leviter gibhosus , ventralis rectus, plerumque 

 in anguld postcriore spina singula forti uinnitus ; valva dextra sinistra minor; 

 valvae ^. elrtngiitae, longitudo altitudinem dui)lam superans; valvae foveis rotundis 

 confertis, obscure fuscae; oculi distincti; articulus penultimus antennarum I. prae- 



