﻿48 MR. F. W 



ON SOME JAVAN DEEP-SEA LAGEN^ 



pseudopodial orifices are irregularly dispersed over the shell-surface, hut leaye a small 

 irregular patch near the middle of each side, smooth and imperforate ; while in others tte 

 tubuli take an oblique direction, radiating from the centre (Z. radlafo-marginata 

 Parker and Rupert Jones, fig. 33). 



This peculiarity is seen in greatest perfection in theii* recent form from the Australian 

 coral-reefs (loc. cit. pi. xviii. fig. 5 a). Some of the two-chambered varieties, howeyer 

 present both the oblique and straight style of foramination in the same shell the 

 primordial chamber sometimes having them radiated, while in the second chamber they 

 pass directly from without to the interior (figs. 60, 62). In some of the costate 

 Lagen(E, such as the L. shiato-purwtata of Parker and Rupert Jones, the pseudopodial 

 passages are said to be confined to the base of each riblet, at either side of which they 

 form a single row of punctations. 



Not unfrequently these flask-like forms are provided with an internal tuhe, which, how- 

 ever, is not seldom absent. When present, it shows great variabiHty, sometimes passmg 

 in a straight line to the bottom of the cavity, where it terminates (fig. 36), or even bends 

 round at right angles and runs along the bottom for a short distance ; or, on the 

 other hand, the tube is cut short at any intermediate point between the orifice and the 

 base. In others it becomes greatly flexed, taking a more or less serpentine form, or is 

 sickle-shaped (fig. 1), while occasionaUy it takes a sigmoid curve, or even curls round 

 at the top Hke a pig's tail. The mode in which the tube terminates is also variable. 

 In some^ it ^ ends abruptly, without any apparent increase in diameter towards the 

 end ; while in others the free end becomes patulous or trumpet-shaped, and in a few 

 cases It widens out like the bottom of a sailor's trouser-le, . 



This mternal tube is not, however, pecuHar to the LagencB, though its appearance is 

 most commonly observable among these sheUs. A similar tube is also present in some 

 01 i\i^ FolymorpMncB and in the ultimate segment of forms of Bentalina legumen, D'Orh, 

 ot wliicH I possess more than one example ; in some of these sheUs the anterior chamber 

 IS also produced mto a long slender external neck. Among some members of the 

 TJTT . r '''*'''''^ *^^' ^' "^^^ ^^" developed, as I have before me a three-cham. 

 iT^U T \ ?^ '^^'^'''^^^ ^^^^^ each chamber of which is provided with a weU- 



lormed mternal stolon-tube. 



clitlflf^'''^? ^^F^ ^ ^^^^ endeavoured, as far as possible, to follow the nomen- 

 '^oS^, I T' ^''^'' ^^^ ^-P^^^^ J--^ -^ -t forth in Dr. Carpenter 

 iM^^i ' T'' ^' *^^ :Poraminifera.' I have, however, reverted to the 

 Z2^Z^frf ^'''' ^^^^^on (Monograph 'On the Recent Eoraminifera 



o 



S 



Great "Rrifnm ' /p o " " "-^c.iu»uu \,ivionograpn » Un tne Jiecent ijoramuiii-- - 



JaS frol t, A T fw^ ''''' P- *' ^ preference to that of mlcata of Walker and 

 var. Lk Jl '-T!,, "°' ""'y ^""^^ ti^e employment of such terms as L. mleA 

 Buch ritf V"*"'''=*"^' '' ^-f • ^"^'--- has pointed out, but, *. 

 mind a wroao IZ^ '"i'"^"' ^^^- ^^"^''"'' ^''e '^^^^ ^se of, it would create on * 

 wWeas" "li Th f' "'^'"''''^ ■' f- " --Id i-f er that the sheU is ribbei 

 With regard to .nl •« '™'*'*'^*'oi of the name vulgaris obviates aU this. 



gradations into eaSt" "T"' *' '^'^' "^ *^^ S^°"P P=^«^ «<> ^perceptibly by so man? 



each other, that structures the most dissimilar are found to be close!? 



