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54 MR. F. W. 0. RYMER JONES ON SOME JAY AN DEEP-SEA LAGEN.E. 



•vvhicli is very remarkable. The longitudinal strijr, instead of being continued to ih 

 centre of the base, or projecting from it in a coronal of sharp spikes, as is frequently th 

 case among these striated forms, suddenly discontinue their rlL-likc decoration at th 

 extreme base of the shell, and all the striae spread over the external surface of the base 

 and, anastomosing with each other, form an irregular network, the meshes of which have 

 no constant size or shape (fig. 21 «). 



This union of the striated and areolated styles of decoration on the same shell is as 

 far as my observations have gone, very uncommon. 



Lagena vulgaeis, Williamson, var. caiidata, D'Orbigny. (Fig. 22.) 



SheU symmetrical, ovate or subcylindiical, widest at the posterior half, gently taperin^ 

 towards the anterior, which is more or less produced into an external neck ; sometimes 

 provided with an internal tube {JSntosolenm tjhlosa, var. lineata, WiUiamson, pi. i. 

 fig. 17) ; posteriorly the shells are slightly truncate or gently rounded, while the extreme 

 base IS provided with a solid mucro of variable length, which frequentlv assumes a more 

 caudate character, and is often slightly bent. The exterior of the sheU is decorated with 

 a variable number of longitudinal stri^. 



In fig. 22 these are also supplemented by a few shorter ones, which are confined to 

 the neighbourhood of the base. This form, though retaining a general resemblance to 

 the i. caudata of Eeuss, differs from it in many respects, being much more elongated, 

 and tepermg very graduaHy into a slender external neck, the orifice at the end of 



Winch IS surrounded by a thickened rim. The basal mucro is more slender and 

 shghtlybent. 



SheU-waUs finely perforated. 



Lageka vulgaeis, WiUiamson, var. desmo^Ura, Nov. (Figs. 23, 24.) 



int!l'fm?5^^''^; ''^''''*^' ""^^^^^ sometimes elongated, flask-shaped, passing anteriorly 

 Ind tlvv T ^''^r^''''^ ^l^^der neck, the end of which becomes sHghtly patdo 

 are tot ^-t^^ Internal tube of variable length. Externally the rf 



menl«r ntcf t ^ tl^\™^^' P--.^ '-m the base to the co. 

 internallv hii+ ^ ^' ^^ *^^ ^^'^^ ^^^ is very thick, being gently curved 



tZt2^1^r ''"" '"'""^^^ ' ^^^ -^^ -1- - ^ent at Ln angle of about 35" 



t1 f 0^ ^^^^^^ ^"^"^ '^ --t P-^ably adventitious. 



oi-ter T^PoV Ia ,.„._ ^ iig. ^4 IS very transparent and svmmetricaL having a mucli 



lUS I 



and symmetrical, having 



The shell is more 



shorter neck anrl iT.f. i :\ ^ transparent and symmetri 



and uXon t «t ,71?' ^^ ''' ^"^^'^"^ ^^^'^ '^ 



the longitudinal band, ^ f o'-^amentation of figs. 19 & 23 ; for in addition v> 



of transmrft^i o.,„„ .... 7 ^''^"'^0* on its exterior, there is a wide trenchant riW 



for in addition to 



side of each " cl>aia 



of transparent shell <;i,w '"""'*• ™ "s exterior, there is 



This paLrn ifS^d rr '"^"""^ '''''"'^ *° ^"^^ '"''^ ^^ 



twine under and oyer ^/i. ?i, *® ^''*' °^ exogenous sheU-deposit, which inter 

 nately. ^^""^ °*1^« ty turns, forming a large and a small link ^^^ 



