PORIl'KRA. II. 21 



of the length, the lateral edges diverge towards the middle of the chela, and are rather much refolded; 

 the tooth is a little narrower than the alee taken together, but of the same or about the same length, 

 and it increases also in breadth towards the end; it is likewise hollow inward. Tnberculnm is longish. 

 When the chela is seen obliquely from behind, the axis may be seen to continue as a thickening 

 down the middle of the tooth and stop a little before the end; this point may often, when the chela 

 is seen from the front, appear as a small tuberculum. The size of this chela varies rather much, the length 

 from 0-043— o-o83 mm , and the breadth proportionally from 0-015— °'° 2 4 mm - 2 - The small is o chelae 

 have a slightly curved shaft, the free middle part of the shaft is less than one third of the length. 

 The tooth is a little narrower than the alte taken together and of about the same length; the alae 

 are much refolded. The length of these chelae is between o-oi8 ram and 0-02 i mm , and the breadth is 

 ca. o-oo4 m,n . 3. Sigmata of the common form; these are curved in the common way, and the ends are 

 highly, almost rectangularly recurved. They are larger than is commonly the case, but vary much 

 in size; the length is between 0-095 and o-25 mm , and their thickness is 0-005— o-oi mm . ° f these sigmata 

 a few developmental forms were found; they are fine and want the recurved ends, they were found 

 of lengths up to the greatest length of the sigma. 4. Flagellate sigmata; these are long sigmata 

 curved in such a way as to get two parallel arms, the ends are pointed and recurved in a hooklike manner 

 almost in a right angle, the recurved parts sometimes reach each other. They are exceedingly varying 

 as to size, the longer axis from 0-03— o-i3 m,n , and the shorter axis from 0-024— oo83 mm , tne thickness 

 in the middle is 0-0018— o-oo5 mm ; otherwise the greatest thickness is not here, but at the ends just 

 before the recurving. These sigmata are plane. Of this form I have seen a single developmental 

 form; it was of the same form as the fullgrown ones, but without the recurved ends. All the forms 

 of microsclera occur both in the dermal membrane and in the other tissue of the sponge; the common 

 sigmata are found in greater numbers than the flagellate ones, and are upon the whole the forms of 

 the microsclera most frequently found. 



This interesting species is very closely allied to the E. decora described by Topsent (Resultats 

 des Camp, scient. du Prince de Monaco, Fasc. XXV, 212, PI. XVII, fig. 8); this latter species forms also 

 a quite thin incrustation, and the skeletal structure seems to be the same. Also the spiculation is 

 much the same, as well with regard to the megascleres as to the microscleres, and also in the occur- 

 rence of the flagellate sigma, which is formed in quite the same way in both species. But with regard 

 to the spiculation, besides some difference in the size of the spicules, the differences are found, that 

 the chelae in decora seem to be of three forms, and that trichodragmata are found in this species. This 

 latter fact especially forms a distinct character, whereas the two largest forms of chelae in decora are 

 all but equal. 



Remarks: The occurrence in this species of the form of sigmata that I have called flagellate 

 sigmata, is very interesting and surprising; this form has hitherto only been known in the two Grllius- 

 species flagellifer and porosus, and in the Porziella clavismpta from the Azores established by Topsent 

 in 1896 (Bull, de la Soc. de France, XXI, 147, fig. a— d), which the author in 1904 in the work quoted 

 above (223, PI. XVI, fig. 5, PI. XVIII, fig. 7) refers to Hamacantha. The sigma occurring in the present 

 species is of a quite similar form as those of the mentioned two GW/zky-species, the only difference 

 being that in the latter one arm is generally longer than the other, while in the present species both 



