500 MESSES. T. B. JONES AND E. CHAPMAN ON THE 



instead of the outer aspect, as a guide in determining the 

 systematic relationship of this form. 



The aulostomate or exogenous growth in the Poraminifera is 

 not confined to the genus FolymorpMna, as will be seen on 

 referring to the figures of the interesting examples of Gristellaria 

 crepidula and G. calcar [var.], given by Dr. Groes in his work 

 on the Foraminifera of the Caribbean Sea *. Here we see the 

 terminal growth and stag-horn condition o£ the aperture well 

 marked ; the last chamber having given off tubular sheaths for 

 a few large pseudopodia. 



The following is, so far as we are aware, a complete list of 

 the known forms of fistulose PolymorpJdncB. They are grouped 

 according to their mutual relationships, with reference to their 

 zoological type-forms, and accompanied with concise notes on 

 the characters of the outgrowths. Thus adding to our know- 

 ledge of the genus, this (first) part of our paper may be regarded 

 as supplemental to the Monograph of PolyviorpJiina by Messrs. 

 Brady, Parker, and Jones, in the Transactions of the Linnean 

 Society, vol. xxvii. 1870 f. 



* A. Goes. — " Oa the Eeticularian E-hizopoda of the Caribbean Sea." 

 Kongl. Svenska Vetenskaps-Akad. Handlingar, vol.xix. 1882, no. 4, pp. 43 and 

 49, pi. iii. figs. 40, 52. 



t The history and aiBnities of this genus are fully treated of in the Mono- 

 graph referred to ; but the critical examination of the Foraminifera depicted 

 in Ehrenberg's ' Mikrogeologie ' not having been completed when that Mono- 

 graph was published in 1870, several inaccuracies were introduced ; and 

 certain errors should be corrected according to Parker and Jones's critical 

 determinations given in the ' Annals and Magazine of Natural History,' ser. 4, 

 vol. ix. 1872, pp. 211-230, 280-303 ; vol. x. 1872, pp. 184-200, 253-271, 453- 

 457. 



Thus at page 213 delete Strophoconus ovum, spicula, and [_Grammostomum] 

 laxus ; at p. 219, Strophcoonus stiliger and acanthopus ; at p. 220, Grammo- 

 stormtm turio ; at p. 223, Strophoconus Hemprichii ; at p. 224, SphcBroidina 

 Farisiensis ; at p. 227, the 1st, 2nd, 3rd, oth, 6th, 8th to the 16th, and the 

 19th of Ehrenberg's species; and add Loxostomum vorax, pi. xxviii. fig. 24; 

 at p. 232 delete Polymor'phina asparagus and turio, Sagrina longirostris, and 

 Vaginulina obsctira ; at p. 233, Vaginulina paradoxa ; at p. 234, Polymor- 

 phina nucleus ; at p. 238, Grammostomum costulatum ; at p. 242 add, under 

 Globulina tuberculata, Proroporus verrucosus, pi. xxix. fig. 19. 



