F. R. Cowper Reed — A new Carboniferous Cep/ialopod. 105 



EXPLANATION OF PLATE V. 



Fig. 1. Trochammina in/fata (Montag.). Fig. 13. Laffena clavata (D^Orh.). 



2. Textularia fflob/ilosii, Ehr. ,, 14. „ sulcata [W. & J.). 



3. BuUinina pupoides, D'Orb. ,, 15. ,, hexagona (Will.). 

 ' ,, 16. Cristellaria crepidiil/i {F.&M.), 



,, 17. Lagena marginata (W. & B.). 



,, 18. Globigerina bulloides, D'Orb. 



,, 19. ,, cretaeca, D'Orb. 



„ 20. Patellma corrugata, Will. 



,, 21. Discorbiim globtilaris (D'Orb.). 



,, 22. Eotalia Beccarii (Linne). 



,, 23. Nonionina deprcssula (W.&J.). 



,, 24. Polystoinella striato -punctata 

 12. Lagena Icevis (Montag.). (F. & M.). 



The fig-ures are maQ-nified 40 diameters. 



II. — WOODWARDIAN MuSEUM NoTKS : A NEW CaHBONIFEROUS 



CePHALOPOD, PleURONAUTILUs'^ SCAliLETTENSlS, SP. NOV. 



By F. R. Cowper Reed, M.A., F.G.S. 



(PLATE yi.) 



FOUR fragments of a large cephalopod (from tbe Carboniferous 

 Limestone) were collected by Professor Hugbes' party in 1892 

 -at Scarlett Quarry, Isle of Man. On fitting tbree of tbese togetber 

 tbey were found to compose nearly tbe complete sbell, and in 

 a suflSciently good state of preservation to warrant description. 

 The fourtb fragment is a cast of a portion of tbe external surface. 

 Mr. G. C. Crick bas expressed bis opinion tbat tbey represent a new 

 species and probably a new subgenus or genus. 



Diagnosis. — Sbell discoidal, compressed ; wborls in contact, but 

 not overlapping ; umbilicus wide, sballow, exposing all tbe wborls ; 

 no central vacuity ; volutions rapidly increasing in widtb. Wborls 

 eigbt in number, laterally compressed and flattened, twice as bigb as 

 broad, Tbe two outer wborls form nearly' four-fiftbs tbe diameter of 

 the sbell, and have steeply sloping walls to tbe umbilicus. Tbe 

 outer whorl bas its sides weakly convex for tbe inner two-thirds of 

 its width and crossed by about thirty transverse rounded plications, 

 which are strongest about tbe middle portion of the whorl, but 

 become gradually weaker towards the beginning of the second 

 wborl, and also towards the aperture, dying out completely a short 

 distance from it. The outer fourtb of this wborl is not crossed 

 by tbese plications, but is deeply excavated into a broad marginal 

 groove bordered by the sharp edge of tbe ventral side. Ventral 

 (peripheral) side rather less in width than diameter of wborl, 

 flattened or slightly concave with projecting edges overhanging 

 the mai'ginal groove on tbe sides. Dorsal side narrow, about one- 

 fourth the width of ventral side, marked by shallow groove where 

 in contact with next wborl. Second wborl with very weak or 

 obsolete transverse plications, and tbe marginal groove very 

 sballow and gradually dying out. Inner whorls poorly preserved, 

 but with nearly flat sides, devoid of transverse plications and 

 marginal groove. Aperture vertical, narrow, lanceolate, with sides 

 produced obliquely forwards to ventral rostrum. Tbe sides of 



