91 



" Descriptions of thirteen new species of Brachiopoda" By G. B. 

 Sowerby, F. L. S. 



Tekebratula NiGRicANS. Tcr. testd antice rotundatd, postice acumi- 

 natd, tenuiuscvld, nigricante ; valvis ineegualibus, radiatim costatis, 

 costis rotundatis ; lined marginali i-ectiusculd ; valvd dorsali sub- 

 trigond, depressiusculd, rotundatd, lateribus posticis declivibus ; 

 foramine magno, haud integro, ąuadrato ; ared cardinali magnd, 

 planiusculd, lateribus rotundatis ; deltidiis angustis ad latera 

 f Graminis coalescentibus ; valvd ventrali depressd, transversim 

 ovatd ; dentibus cardinalibus ut in T. psittacea ; margine valva- 

 rum crenulato. 



A single specimen of this very interesting species was found in 

 the collection of the late G. Humphrey, without locality. This and 

 the T. psittacea are the only species that are not punctated. 



Terebratula Japonica. Ter. testd oblongd, antice rotundatd, tenui, 



albicante ; valvis subcegualiter convexis, longitudinaliter radiatim 



striatis, striis numerosis, subirregularibus, subbifurcatis, ad latera 



prope cardinem confertiusculis ; lateribus prope cardinem subpla- 



nulatis ; lined marginali rectiusculd, ad latera postice declivi ; 



valvd dorsali postice subproductd, truncatd ; foramine mediocri, 



haud integro, perobliguo ; ared cardinali inconspicud, deltidiis ob- 



soletis ; interno parvo, ^ longitudinis valvce, ramulos duos angus- 



tos, demum amentum latum flexuosum sistente ; marginibus valva- 



rum minutissime denticulato. 



Shell oblong, rounded in front, thin, whitish; valves nearly eąually 



convex, longitudinally radiately striated, strise numerous, rather 



irregularly dichotomous and very close-set on the sides near the 



hinge ; the sides near the hinge rather fliattened ; marginai line 



nearly straight, inclining to the sides near the hinge ; dorsal valve 



somewhat produced posteriorly and truncated, -vvith a moderate-sized, 



very oblique and incomplete perforation ; cardinal area indistinct, 



vpith obsolete deltidia; internal appendages small, one-third the 



length of the valve, with two narrovi^ little branches, and then a broad 



flexuous loop ; margin of the valves very minutely denticulated. 



In Mr. Cuming's collection, from Japan. Easily distinguished 

 from T. cancellata of Koch by its foramen not being entire. 



Terebratula crenulata. Ter. testd suhorbiculari, postice subacu- 

 minutd, subtruncatd, crassiusculd , albicante; valvis in<equalibus, 

 radiatim costatis, costis paucis, majusculis, rotundatis ; lined mar- 

 ginali flexuosd, antice subsinuatd ; foramine magno, subintegro ; 

 ared cardinali magnd, subplanulatd , margine undulato ; deltidiis 

 magnis, discretis ; valv<B ventralis margine postico ad utrumgue 

 latus declivi ; ossiculo interno e spind validd obtusd antice por- 

 rectd, ramulis duobus lateralibus retroversis ; margine valvarum 

 crenato. 

 Shell suhorbicular, rather attenuated and subtruncate behind, 

 rather thick and \vhitish ; valves unequal, with few rather large, 

 rounded, radiating ribs ; marginai line flexuous, slightly sinuated in 



