148 Pelecyijoda. — Myacea. Pholadacea. 



Aradas et Benoit), Messina (Seguenza); Pantellaria, Tunis (McAndeew); Adria: 

 Cherso (Gtrube), Zara (Sandri), frequ. (Stossich); Morea (Deshayes), sin. Cervi 

 (FoRBEs) ; mare Aegeum, Lycia (Foebes). 



Arcinella Phil. (nec Oken, nec Schum. , subgen. Saxicavella Fischer). 

 Tesfa aequh-alvis, inaequilatera, hians, ovato-transversa aut subtrapezoidea, post oblique 

 angulosa; cardo aut edenttdus aut dextra dente parvo primario conico; margine dor- 

 sali utrinque in lamdlam. prodticto. 



m 1. A. angulata Kob. (Sphenia angidata S. Wood, A. carinata Phil.,. 

 Saxicava? angulata Monter.). Testa rainuta, transversa, oblonga, valde inaequi- 

 latera, tenuis, fragilis, antice brevis, postice carinata, angulata, producta, granu- 

 losa; cardo unidentatus. — Long. 12, alt. 6 mm. 



Habit. : Palermo, 90 — 120 m. prof. (Monteeosato). — Fossilis in stratis 

 tertiariis. 



2. A. plicata Saes {Mytilus pUcatus Mtg., Panopaea plicata Jeffr., Saxi- 

 cava fragilis Nyst). Testa minuta, sat compressa, oblonga aut subtrapezoidea, 

 valde inaequilatera , antica parte brevi et rotundata , postica expansa et oblique 

 rotundato-truncata ; umbones parvi in ^/3 anteriore siti; valvae inaequales, postice 

 hiantes, tenues, fragiles, albae, postice eminentia diagonali ab umbonibus radiante 

 instructae; epidermide tenui flavescente. — Long. 7 mm. 



Distrib. : Atlanticum septemtrionale et arcticum; Korea. 



Habit. : 5 — 628 org. prof. ; Gibraltar (McAndrew, Jeffeeys); Spezia? 

 (Tapparone-Canefri) ; „Adventure Bank" (Jeffreys). 



28. Fam. GASTROCHAENIDAE (Gray) Fischer. Animal symmetricum, 

 elongatum; pes brevis, subcylindricus, sinebysso; branchiae elongatae, inaequales, 

 post connatae, in siphonem branchialem elongatae; testa tenuis, antice et infra, 

 hians, cardine edentulo; saepe tubus accessorius. 



Gastrochaena Spglr. (Fistulana Brug., Bocellaria Fleur.). FaUii marga 

 ventralis connatus, rima pedali parva, siphones longi conjiincti: pes parvus digifi- 

 formis, sulco laevi, sed sine hysso ; branchiae angustae inaequales, externa brevior ; 

 palpi falciformes; testa inclusa, valvis aequalibus, inaequilateris , maxime hiantibus; 

 umbones fere terminales, epidermis membranacea ; ligamentum externum elongatum,. 

 cardo edentulus. 



1. G. dubia Desh. {Mya dubia Penn. , Pholas pusilla Poli , G. pelagica 

 Risso, G. tarentina 0. G. Costa, G. modiolina Lam. , G. cuneiformis DCh. , nec 

 Lam., G. Polii Phil., Fistulana hians Desh.). Testa oblonga, cuneiformis, tenuis, 

 subpellucida, striis incrementi valde conspicuis, valde hians, maxime inaequilatera^ 

 albida , epidermide lutescenti-fusca ; ligamentum semicylindricum , subprominulum ; 

 cardo interdum medio ad modum dentis incrassatus. — Long. 4 — 10, alt. 6 — 23 mnu 



Distrib. : Atlanticum; mare rubrum. — Fossilis in stratis tertiariis. 



Habit. : Gibraltar (Mc Andrew) , Cabo de Palos, Barcelona (Hidalgoj;. 

 ins. balear. : Mallorca (Hidalgo) , Mahon (Lacaze-Duthiees , Hidalgo) ; Alger 

 (Wbinkauff), Rashgun (Deshayes); litora Galliae (Petit), Cette, Carnon, Palavas 

 (Dubeeuil), Aigues-Mortes (CLfiMENT), Marseille (Ancey), Pharo, Montredon, Po- 

 megue, Garlaban (Maeion), Toulon (Gay), St. Tropez (Doubliee); Nizza (Risso, 

 VSrany); Corsica (Reuuien); Sardinia (Mc Andrew) ; Spezia (Tapparone-Canefri); 

 Napoli (PoLi , Delle Chiaje , Scacchi) ; Sicilia (Philippi , Aradas et Benoit) ; 

 Malta (Caillot, Aradas et Benoit) ; Taranto (Costa); Adria: Veuezia (G. v. Mae- 

 tens), Trieste, Cherso, Neresine, Crivizza, Privlaka (Geube), Lesina, Lissa (Hei - 



