150 



short and thick proximal ones. The distal wall is more bent (at a right or an 

 acute angle), and the distal half of each lateral wall may have 1—2 rosette- 

 plates. 



In referring the species, described above, to Electra, although the distal wall 

 has two multiporous rosette-plates instead of a row of uniporous ones, the reason 

 is that the rosette-plates of the distal wall in many species show rather great 

 variation even in the same colony. Otherwise this species is most closely allied 

 to E. monostachys. The peculiar doubling of the proximal spine may possibly 

 explain the origin of the two proximal corner-spines in Membranipora membrana- 

 cea and may then be considered as evidence of the development of Membranipora 

 (sensu stricto) from Electra. Both genera agree in possessing few multiporous 

 rosette-plates on the lateral walls and in their constant lack of avicularia and 

 hyperstomial ooecia. 



Callopora (Gray) Norman \ char, emend. 

 Alderina Norman ^ Amphiblestrum Gray p. p., Ramphonotus Norman ^ 



Doryporella Norman*. 

 (PI. IX, figs. 3-4). 



The zocecia, which may have a varying number (0 — 16) of spines and a 

 cryptocyst developed to a varying extent, are provided with a small number 

 (5 — 6) of large few-pored pore-chambers. The ooecia are hyperstomial. The ecto- 

 ocecium, the calcified part of which often ends in a projecting margin, has a 

 larger or smaller uncalcified frontal portion. Dependent avicularia generally 

 appear, more seldom independent ones as well. The former may appear distally 

 to the ooecium in an oblique position and singly or in pairs, while in zocecia 

 without ooecia they may appear singly and in different positions on the proximal 

 part of the zooecium. 



Of species known to me 1 must to this genus refer Callopora lineata, C. crati- 

 cula, C. Damerili, C. aurita, Amphiblestrum Flemingi, A. trifolium, Ramphonotus 

 minax, Alderina imbellis and Doryporella spathulifera. Despite the great variation 

 in a series of structures all the above-mentioned species are so closely con- 

 nected that it appears to me to be necessary to refer them to the same genus. 

 In all of them there is a small number of few-pored pore-chambers, and they 

 all have hyperstomial ooecia with a partly uncalcified ectoooecium, which how- 

 ever may be of very varying extent. The calcification of the ectoocEcium is least 

 developed in C. Dumerili, in which species it appears only as a narrow mar- 



» 83, p. 588. ^ 83, p. 596. ' 83, p. 597. • 84, p. 106, 



