lHl'2 HKLICKKAS. U K I, KM X I T KLI.A . KIT. 



Section I. ACCKLI, Bronn. Rostrum without dorsal or ventral i;: 



at its anterior end. 

 Subsection 1. Acuarii, Orb. Rostrum more or less conical, with- 



out lateral furrows, but often channeled at the posterior end. 



Jura., Chalk. 20 species. 

 Subsection 2. Clavati, Orb. Shell lengthened, with lateral fur- 



rows. Lias., 3 species. 

 Section II. GASTROCCELI, Orb. Rostrum with an anterior ventral 



groove. 

 Subsection 3. Canaliculati, Orb. Rostrum without lateral grooves. 



Jura., 5 species. 

 Subsection 4. Hastati, Orb. With two long lateral grooves. 



Jura., Chalk, 19 species. 

 Section III. NOTOCCELI, Orb. With a deep dorsal groove. 



Subsection 5. Dilatati, Orb. With lateral grooves. Neocomian. 



9 species. 



B. EXCENTRTCI s. PI, '.15. HO-. 455. Oxford. Oolite of K upland. 

 B. SEMIHASTATUS. PI. *.).">. lijjs. 45C.. 457. Jurassic of WiU'h'mlm i'fj. 

 B. SEMI HA STATUS. I'll rn^niocoiic : view of siplioicd side (1ii-. 4.">T). 



(J.'iius HELICERAS, Dana. 



H. FUGIKNSJS. DaiiM. PI. 1)5. fiu". 4;")8. In slate rock. Capr 

 Horn. Only species. 



Gcnue BELEMNITELLA, d'Orb. 



Six s]>ecies are found in the upper jrrei'iisaiid and chalk of 

 Europe and North America. 



B. MUCRONATA, Sowb. PL 95. fi t a'. 459. 



Genua XIPHOTEUTHIS. lluxl.-v. 

 Founded on a single Ku^-lish liassic species. 

 X. EJ,ONC;ATA, De la Bcche. FM. 05. \\<t. 4(')0. 



Genus ACANTHOTEUTHIS, Wagner. 

 Oolitic. Seventeen 



A. ANTIQUUS, Gunnington. PI. '->5. (!. 4U1. Oxford clay of 

 Wiltshire, Eng. 



