28 G. LINDSTRÖM, HELIOLITID^.. 



the septa (»Radiai"lamelleii>0 are between 8 — 14. Evidently there are several quite diffe- 

 reiit species and even genera commingled under the name of Pol. Blainvilleana. The 

 other forms have shoi't, nuinerous septa and the siirface resembles that of Heliopora. 

 Michelin's Hel. (Polytremacis D'Orb.) Blainvilleana can scarcely, if we may judge by 

 his obscure figures, be identical with the homonym species of Reuss and they cannot be 

 retained in the same genus. Michelin's species which is provided with a greater number 

 of septa is probably identical with the Heliopora Blainvilleana of Quenstedt (Petref. 

 Deutschl. p. 901, pl. 170 lig. 30) which this author also thinks is the same as Reuss' 

 first species Polj^tr. Partschi. As I have not been able to examine their specimens, I must 

 leave this for other authors to decide. It seems, however, doubtful whether Polytr. Partschi 

 Reuss with its peculiar broad, collarlike circle of septa or pseudosepta and its starry 

 coenenchyma can be identical Avith Polytr. Blainvilleana Michelin & Quenstedt. Polytr. 

 macrostoraa, the third species of Reuss may also be generically different from the others. 



I have had some few specimens of two species kindly sent me from Dr Laube in 

 Prag, one called P. Partschi Reuss, ^ the other P. Blainvilleana, none of them corresponding 

 with the descriptions or figures of Reuss, though that which is denominated Pol. Blain- 

 villeana comes near to Pol. Partschi of Reuss. Both have a great number of short pointed 

 septa, amounting to between 30 — 40 in the larger calicles, and continuing outwai'ds in 

 (•onnection with the coenenchyma. This is cjuite different in both: reticulate, open tubes, 

 Heliolites-like in P. Partschi, spiny or warty in P. Blainvilleana. In a horizontal 

 section of the latter small narrow tubes, somewhat arranged in lines or series lie imbedded 

 in a thick mäss, which in a longitudinal section is composed of rods, baculi, the formei- 

 species has some scarce tabula' in the narrow tubes. I have examined a specimen sent 

 from the Geologische Reichs-Anstalt in Wien with the denoraination Polytremacis Blain- 

 villeana with the number of septa varying from eight to twenty; tabulas in the calicles 

 and the coenenchyma] tubes; the coenenchyma on the surface with small points or also 

 smooth. 



To sum up, if a genus ever was in need of revision it is this, and untill this has 

 been executed by somebody provided with sufficient material to accomplish the research, 

 we may suspend our final opinion as to the systematic position of it and in the mean- 

 while keep it apai't from the Heliolitida;. 



Stylopltyllnvi Reuss is by Zittel enumerated as one of the Helioporidte along with 

 the Heliolitidte. The description and figures of Reuss ^ show that it is a niost abnormal coral, 

 without any coenench^yma at all and with a great number of septal spines in irregular rows 

 and vesicular tabul» and that it consequently does not show any affinity with the Heliolitida'. 



* It may here be reiiiarked tluit. the ttgures of Heliopora Partschi, p. 212 ZlTTEL Palaeozoologie, beloug 

 tu widely different species. Figure 122 i is evidently a reprodiictiou of tig. 7 pl. xsrv of Reuss' memoir in 

 Wiener Denksehrifteu vol. 7 and by him inteuded to represent a longitudinal section of Polytrem. Blainvilleana. 

 But this species, as stated above, more Heliolitidean than any, cannot be a Heliopora, nor a Polytremacis, and 

 must form a new genus. A longitudinal section of Heliopora, as wel! as of Polytremacis is (juitc different. 

 Netimayr in his 'Starameä pag. .305 has again reproduced the tigure of ZlTTEL and names it simply Heliopora- 

 and ho descriljes it also as representing the living Heliopora, what is highly misleading. The lig. 122f( should 

 represent Holiop. (Polytremacis) Partschi, but the inrtistinctness of its executiou allows no decisive opinion of 

 what species it really is. 



- Wiener Ueukschriflen, 18.54 vol. 7 p. i:i2 pl. xxi tig. 1 — ;}. 



