146 CLASS IV. 



composing the calyx. Kays pinnate ; pinnae silicate, the furrows 

 confluent with the longitudinal furrow of the rays ; tentacula situ- 

 ated in the furrows. Mouth and anus on the ventral side ; mouth 

 central in the bottom of the calyx ; anus lateral, tubular. 



See J. MUELLER, Ueber die Gattungen und Arten der Comatulen, 

 ERICHSON ArcMv fur Naturgesch. 1841, s. 139 148, and Neue 

 Beitrdge zur Kenntniss der Arten der Comatulen, ibid. 1843, 

 s. 131136. 



* Rays of Calyx Ufid (ten-rayed). 



Sp. Comatula rosacea, Alecto europcea LEACH, FOKBES Brit. Starf. p. 5. To 

 this species belong the observations of THOMPSON spoken of above, 

 (pp. 136 and 143). Memoir on the Pentacrinus europceus, Cork, 1827. 

 Comat. carinata LAM., GUER. Iconogr. Zooph. PI. i. fig. 2. 



** Rays of Calyx multiftd (many-rayed). 



Sp. Comatula multiftda MUELL., Com. multiradiata LAM. &c. 

 The species, which like Pentacrinus have a pelvis, form the genus Comaster 

 AGASS., MUELL. Here belongs Comatula multiradiata GOLD, (not LAM.) 

 Fossil species of this genus are found in lithographic stone. 



Family II. Asteridea. Body depressed, free (not pediculate), 

 multangular or radiate, with integument coriaceous or calcareous. 

 Kow of joints calcareous internal, running along the middle of 

 the rays and taking their origin from the mouth. Mouth central, 

 inferior ; anus dorsal or none. 



A capital work on this division was published some years back, 

 System der Asteriden von J. MUELLER und F. H. TROSCHELL, mit 12 

 Kupfertafeln, Braunschweig, 1842, 4to. As plates for this and the 

 preceding family may be recommended : J. H. LINCKII De Stellis 

 marinis Liber singularis, Lipsise, 1733, fol. 



Phalanx I. Ophiurce. Disc distinct from the arms ; with arms 

 non-sulcate. Anus none. 



Euryale LAM. (G-orgonocephalus LEACH). Arms prehensile, 

 contortile towards the mouth, not scutate, sub-rotund, flattish be- 

 neath. Disc tumid, sub-globose, with five obtuse angles. 



According to the division of the arms the species of this tribe 

 are arranged in three different genera by MUELLER and TROSCHELL. 

 They are undivided in Asteronyx, divided dichotomously and only 

 towards the end in Trichaster AGASS., divided from the base, first 



