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 PKOGEESS OF MICROSCOPICAL SCIENCE. 



Examination of Goal for Diatoms. — We have received a note from 

 Count Castracane, calling attention to an accidental error in the 

 account we gave in the last December number of this Journal * 

 of his method of examining coal for diatoms. The ash should be 

 heated with hydrochloric acid, and chlorate of potash added from time 

 to time — not caustic potash, since, of course, this would only tend to 

 neutralize the acid, or, if added in excess, would dissolve the diatoms 

 themselves. 



A New Phyllopodous Crustacean is described by Mr. W. Lockington, 

 who read a paper recently before the San Francisco Microscopical 

 Society on the subject.^ He said that the animal, which is nearly 

 allied to Artemia salina, the inhabitant of the salt-pans of Lymington, 

 inhabits the Great Salt Lake of Utah. The inferior autennfe in the 

 male are two-jointed. The fasal joint, with a short rounded process 

 (in Artemia salina this is conical) ; the joint itself thick and rounded ; 

 the second or terminal joint broad and fan-shaped, and the whole' 

 antennae somewhat resembling the mandible of a stag-beetle in general 

 appearance ; the inferior antennae in the male and both pairs in the 

 female slender and filiform ; thorax with eleven pairs of branchiae eyes 

 on short peduncles ; abdomen nine-jointed ; the end joint two-lobed, 

 each lobe bearing a variable number of setae (4-6) ; colour a dark 

 purplish brown. From the locality in which it was collected, it is 

 proposed to name the species Artemia Utahensis. 



The Development of Lepas fascicularis and the " Archizoea" of Cir- 

 ripedia. — Dr. E. von Willemoes-Suhm sent to the Eoyal Society a 

 valuable paper on the above subject, which will doubtless be fully jjub- 

 lished in the ' i'hilosophical Transactions.' The following abstract is 

 given of it in the last number of the ' Proceedings of the Royal 

 Society,' No. 165. 



I. Development of the egg and of the youngest Nauplius. 



The conclusions to which an investigation into the development 

 of the ovum, and into the changes which occur in it after its formation 

 up to the time when the Nauplius comes out, has led are the fol- 

 lowing : — 1. The youngest eggs, seen in the caeca of the ovarian tubes, 

 are transparent cells with nucleus and nucleolus. 2. The germinal 

 vesicle, as well as the ovum, grows by taking up elements of yelk. 

 3. All the ova found in the ovary of a barnacle are in the same stage 

 of development. When mature ova are to be seen in the tube, small 

 undeveloiDed ova may be seen here and there in the caeca, which act 

 very likely as mother-cells for further bi'eeding purposes. 4. The 

 spermatozoa, when fully developed, are simple hair-like filaments. 

 5. The mature ovum, as contained in the breeding lame! las, shows no 

 trace of the vesicula germinalis nor of its nucleolus. Some highly 

 * Vol. xiv., p. 291. t ' Ciuiinn. Med. Journal,' January. 



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