28 



extremity, shortly pointed; and this extremity does not extend nearly so far as to the siphons. 

 They are, along their dorsal edge, connected with the body, and by a longitudinal groove 

 divided in 2 parts (fig. 43) of which the upper is only about half as wide as the lower; both 

 consist of numerous transverse lamellae. The palpa were not to be recognised: they appear 

 to be obsolete or rudimentary. 



This remarkable shell occurs, somewhat rarely, in Lofoten at the depth of 120300 

 fathoms on clay bottom; likewise in the Hardangerfjord, where it has also been found by 

 Danielsen at a depth of even 500 fathoms. Moreover it has been found at still greater depths 

 in many places in the Atlantic ocean during the British expeditions (with the Porcupine). 



The Genus may accordingly be characterised as follows. 



Gen. Pecchiolia. Meneghini. 



Testa inaequivalvis, valva dextra majore, valde iimequilatera, ovata, rhombica, seu tra- 

 pezoidea, tenuis inflata undique clausa intus submargaritacea. Umbones prorsus antice siti, 

 tumidi prominentes, incurvati, antrorsum involuti subspirales. Cardo edentulus; ligamentum 

 internum in fissura linear! cujusque valvai sub umbones situm et ossiculum continens oblon- 

 gum planulatum testaceum mobile. Impressiones musculorum adductorum parvse rotundatse 

 seu subovales, anterior bene distincta prope marginem anteriorum sita; posterior subobsoleta 

 margini dorsali approximata; linea pallialis integra sinu nullo. Epidermis tenuissima parum 

 distincta. 



Animal crassum, pallio occluso apertura oblonga ventral! subanteriore pro pede emit- 

 tendo exc.epta. Siphones separati subsessiles; branchialis non prominens, amplus, margine 

 tentaculis cinctus sat magnis utrinque pinnulatis papillisque numerosis subulatis obsitis; analis 

 prominens angustior subconicus, margine integro (absque tentaculis). Margo posterior pallii 

 siphones ambos cingens serie papillarum conicarum ornatus. Pes subcylindricus seu subulatus 

 longus ad basin bysso longo tenuissimo ornatus. Branchiae elongato-subsemilunares utrinque 

 apparent singulse, sed sulco longitudinal! in duas partes transverse plicatas inferiorem supe- 

 riore fere duplo latiorem divisse. 



Spec. Pecchiolia abyssicola, M. Sars. 



Testa parva, alba, translucida, parum nitida, arenula tecta, striis radiantibus tenuissimis 

 distantibus; intersticiis radiatim punctatis, antice rotundata, postice truncata, angulis posteri- 

 oribus rotundatis marginibus Isevibus, dorsali et ventrali sub-parallelis. Longit. 5 mill. ; altit 

 4 mill.; crassit. (valvarum ambarum) 3 mill. 



Habitat ad insulas Lofotenses in prof. 120300 orgyar. fundo argillaceo arenoso, nee 

 non in sinu Hardangerfjord usque ad 500 orgyas. Ceterum in magno abysso Ocean! Atlan- 

 tic! a clariss. Jeffreys inventa. 



According to obliging communication from Jeffreys, the genus Pccdiiolia was established 

 by Prof. Meneghini in ,,Revue et Magazin de Zoologie (Guerin M^neville) 2e. serie. T. TV. 



