CEPHALOPODA. 85 



semicanaliculatus^. All these species are very nearly allied to one 

 another, and specimens are often difficult to determine. Another 

 characteristic feature of the group Actinocamax, is the presence of 

 a double pair of lateral grooves running along the guard, but this 

 is not so constant nor so characteristic a feature as the one first 

 mentioned. 



This species is well known from Speeton in Yorkshire, under 

 the name Belemnites jaculum, Phill. Elsewhere in Europe the 

 name jaculum is scarcely known, Phillips's figure being too rough 

 for identification (Goldfuss). I cannot find any character to dis- 

 tinguish it from B. pistilliformis, Blainville. 



Herr von Strombeck tells me he considers his species Ewaldi 

 to be the same as jaculwm, Phillips. 



Measurements, etc. In the Woodwardian Museum are three 

 specimens, all of them of rather slender, elongated type, regularly 

 but not strongly fusiform. 



Length, 2| inches ; breadth at centre, 8J mm. ; breadth at J in. 

 from proximal end {Actinocamax), 7mm.; breadth at Jin. from 

 apex. 7 mm. 



Localities. Upware, Speeton, Tealby (Mid. Neocomian). 

 N. Europe. Elligserbrink (Hilsthon); Kirchdorf, Oberer Hils 



(Gottingen Museum). 

 >Si. Europe. Varappe, Alpine Cretaceous (Ooster), Mont 

 Saleve (Mid. Neocomian), Voirons, St Croix, 

 Castellana. 



Belemnites pistilliformis, var. subfusiformis, d'Orbigny. 

 (Plate l, fig. 6, a — d). 



Belemnites pistilliformis, var. subfusiformis., Easpail, 1829, Hist. 

 Nat. des Belemnites, pi. viii, fig. 93, p. 55 ? 



„ subfusiformis, d'Orbigny, Terrains Cretaces, I. p. 50, 



pi. 4, fig. 9, also Supplement, p. 24. 



„ minimus y de Blainville, 1827. Mem. sur les Belem- 



nites, t. V. f. 5, 6 ; t. IV. f. 1 y^non Sowerby). 



1 Belemnites hastatus of the Oxford clay, and B. clavatm of the Lias, occur in a 

 similar condition, but the double pair of lateral grooves are not well developed in 

 these species. 



