IN THE MORPHOLOGY OP THE CTSTIBEA. 7 



1-5 and 1-6 respectively (PI. I. fig. 4). E. granatum has three 

 other rhombs in the higher parts of the cup, while in E. striatus 

 and E. angulosus there is but one, on plates 14-15 (PL I. 

 fig. 4). This, together with that on plates 1-5, reappears in the 

 two British species, and a third rhomb, on plates 12-18, is often 

 present (PI. I. fig. 3). All the species of Pseudocrimis have 

 rhombs on plates 1-5 and 14-15 ; while in the two bifasciate 

 species (P. lifasciatus and P. magnificus) the third or left-hand 

 rhomb is on plates 13-17 *, its lower half being on radial D (13) 

 instead of on radial E (12), as in EcTiinoencrinus armatus (PL I. 

 fig. 3). I believe, however, that it occupies the latter position in 

 the two quadrifasciate species, as it also does in Apiocystis, but 

 the fact is not mentioned by Porbes. His figures of the two 

 bifasciate species show that they have but four supra-ovarian 

 plates, that of interradius AB (No. 16) being absent. It is 

 present, however, in the other two species, or at any rate in 

 P. quadrifasciatus ; while in none of the specific descriptions is 

 there any reference to a 19th plate in the cup. But in the generic 

 diagnosis five supra-ovarian plates are described t, thus raising 

 the total to nineteen, viz., 4, 5, 5, 5. 



"We meet with a similar difficulty in the ease of Apiocystis. 

 On p. 501 it is stated that the number and arrangement of the 

 plates is the same as in Pse^idocrinus. But there is no mention 

 of any plate 19, and upon p. 502 the supra-ovarian series is de- 

 scribed as consisting of four plates only, though five are mentioned 

 in the generic diagnosis on p. 503. At any rate, if one be missing 

 it is not that of the interradius AB (No. 16), which would nor- 

 mally rest on radials 10 and 11, and is absent in the bifasciate 

 species of Pseudocrimis ; for this plate is well shown in Forbes's 

 figures 1 and 6, as also in Pseiodocrinus quadrifasciatus. The 

 two interradials of the left side (17, 18) are certainly present, 

 as also the second one on the right (15), but it is not easy to make 

 out from Forbes's figures, or indeed from the specimens, whether 

 one is present on the anal side. According to his descriptions 

 Apiocystis resembles EcMnoencrinus angulatus in having rhombs 

 on plates 1-5 and 14-15, and he mentions a third on plates 13-18 

 of the left side. I believe, however, that 13 is here a misprint 



* In Forbes's diagram of P. magnificus the two halves of this rhomb are 

 stated to be on plates 13-18. The latter is obviously a misprint for 17, as is 

 apparent from the figures of the species ou Forbes's plate xii. 



t Loc. cit. p. 500. 



