158 



KECOUDS OFTHK AL'STKAMAN MISKUM. 



(JKNKI.'IC Kh:Y. 



A. Ocecia occur. Tin? aperture is proviile"! with a narrow siuu-s. The covermg uicui- 



hrane is everywhere kept (listen<le<l l>v narr<jw ri<l<fes from the crj'ptocyst 



■ •• •■• Urr.olli,,:.:.. 



B. Nt> ouicia, }»ut tw<» ditt'ereut tonus of zoijecia are pi'e.seut. 'I'lie aperture withiiut 



a siuu.s. MUil with an almost straight proximal mari;in. 



((. TliH frontal cryiitocyst forms a continuous calcareous surface; tlie cuveriuijj 

 nit^nilirane is on thn frontal, as well as the hasal surface, distemleil by 

 means of rod-sliapeJ processes from tlie cryptocyst Eiithiiris. 



i. Tlit^ frontal surface of the cryotocyst is formed by a numl)er of narrow, and 

 only partially meeting ribs ; the covering membrane is kept distended only 

 on the basal stu'face of the c<ilony by means of a wedge-shaped, and pro- 

 jecting central portion of the separate zoo-cia Plcn i-otolrhnx, 



V. No otecia and one form of /.oLCcium. Aj)erture without ii sinus and with a 

 slightly h.ollowed proximal margin. The covering nu'Uiltrane is on the 

 frontal as well as the basal surface, kept <listeuded by meays of rod-sha;.ed 

 processes from the cryptocyst. .An aviculariuiu may be situated to the 

 right or tlie left of the aperture .Wo^d/Zd/ ,■'.<. 



Ni:iiEriHYi;is \vii(isiki;i, M<ir( ;ill i n-'i ij. 

 (Kio-. 1). 



Euthijrig ininstrri, Mae(Jilli vrav, Pioe. \ioy. Soc. Vict. (n..s.) iii.. 1891, f). 77, 

 })I. i.K., f. 2. hi. H aimer, <^ .1. Micr. Sci. (ii.s.) .xlvi., 2, 1908, p. 1>H8. 



Zocecia sliglitly calciHt^d, arrang-ed alternately in a loiigit iidiiial series. 

 elongate oval in sliape, and i-oumied anteiioi'ly but flattened l^asallv. 



l-iU 1. .\'""ii//ivi, 



