ftATHERINGS MADE AT KEEGTJELEN'S LAND. 57 



Asteromphalus Wyville-Thomsonianus. Marine* PL I. fig. 5. 



Diameter '0024. Primary rays broad, deep, extending from the centre 

 to the margin, dividing the disk into six compartments, of which five 

 are of the same dimensions, and the sixth double the breadth of the 

 others, without any dividing line. The several compartments areo •• 

 late, the five equal ones to the extent of one fifth of the diameter, 

 the remaining compartment to the extent of one third of the dia- 

 meter. Secondary rays seven, extending from the centre, five 

 touching with their ends the middle points on the inner margin of 

 the equal compartments, and two others much shorter and nearly 

 parallel, terminating close together on the inner margin of the large 



* 



areolate compartment. 



This form, on first inspection, closely resembles in its general 

 appearance Asterolampra rnarylandiea, Ehr., var. /?, as described 

 by Wallich (Q. J. M. S. Jan. I860, p. 47, pi. ii. fig. 18); but from 

 the above description it will be evident that it differs not only spe- 

 cifically, but generieally. 



No. 7. Algae from a surface-net put over when H.M.S. ' Chal- 

 lenger' was at anchor in Betsy cove, Kerguelen's Land, the net 

 probably dragging on the bottom in the inlet. 



It would appear from the presence of numerous forms of Odon- 

 tidium hyemale, Lyng., that there was some discharge of fresh 

 water in the immediate vicinity ; but all the other forms were 

 marine. The amount of Diatomaceous material in this gathering, 

 it is to be lamented, was extremely small, supplying only a very 

 few slides ; but for the amount the forms were numerous, and of 

 great interest. 



The following is a list of the known species : 



Actinocyclus Ralfsii, W. Sm. (the disk is much larger and the 

 areolation finer than that of other specimens observed elsewhere) ; 

 Cocconeis pacifica, Grun. ; C. Scutellum, Ehr., C. reyalis, Grev. ; 

 Goscinodiscus centralis, Ehr. ; G. concavus, Ehr. ; G. fimbriatus, 

 Ehr. ; C. perforatum Ehr. ; C. radiatus, Ehr. ; G. radiolatus, Ehr. ; 

 C. subtilis, Ehr. ; Eupleuria pulchella, Arnott ; Gramrnatophora 

 marina, Lyng. ; G. serpentina, Ehr. ; G. maxima, Grun. ; Melosira 

 subfiexilis, Kiitz. ; Nitzschia panduriformis, Greg., Orthosira ma- 

 rina, W. Sm. 



Besides the above-named species, the following were found 

 which do not seem to have been previously described : 



Coscinodiscu8 Mosrleyi, Marine. PI. I. fig. 6. 



Frustule highly lenticular, of immense size, the diameter of the valve 



f2 



