136 Prof. M‘Intosh’s Notes from the 
may occur, A large well-developed ovum may appear in 
the eelom and a male gonad in the segment. 
In schizogony, in its asexual phase, it is exceptional to 
find seven segments in the thorax. At the tenth abdominal 
segment cephalo-br anchial proliferations occur with two new 
segments of the thorax, instead of the three or four of the 
oozoite. No sexual elements appear. In schiz ogony accom- 
panied by sexuality male elements are found in the aldo- 
minal segments (9-10), such probably being a further stage 
of the protandrous young. In the hermaphrodite forms the 
elements are reduced in quantity—for instance, in a schizo- 
nozoite of twenty segments. 
He makes the noteworthy remark that schizogonous indi- 
viduals by their size and the number of their segments are 
little advanced in age compared with the hermaphrodite 
forms. Another fact is that when sexuality is present it is 
reduced male, female, or hermaphrodite. These are stages 
in the march to complete hermaphroditism. ; 
Malaquin concludes that Salmacina dysteri, Husley, 
exhibits all the forms: of sexuality possible. It, indeed, 
shows a kind of indifferentiation in sexuality, marked by the 
absence of secondary sexual characters in the individual. 
The sole character which distinguishes the phases from each 
other is the position of the genital segments and their state 
of advancement. Schizogony occupies the middle period of 
the existence of the annelid. It is intercalated between the 
two sexual periods—protandrous or rarely female, or herma- 
phrodite. The sexual period ultimately marks the end of 
the evolutionary cycle in 8. dysterd. ‘he exclusive sexual 
form is hermaphroditism. In a certain number of these 
the male elements predominate. It thus reappears in the 
life-eyele after its presence in the young oozoite. 
Miss Pixell* (now Mrs. Goatachi deseribes Salmacina 
dysteri from Gough Island, in the Antarctic Sea, as occurring 
in fairly large masses. No buds were prescnt, She also 
finds the same species in various parts of the Indian 
Ocean fT. 
Fauvel{ (1914) describes Filograna implexa from the 
Gulf of Gascoigne, Monaco, and other sites, the agglome- 
rated tubes forming considerable masses analogous to those 
of Salmacina dysteri, from which, he observes, the animal is 
easily distinguished by its two opercula. The same author 
alludes to Salmacina incrustans, the very fine tubes of which 
* Trans. Linn, Soe. vol. xvi. p. 87 (19138). 
+ Trans. Roy. Soc. Edin. vol. xlix, Pp 350 (1915). 
¢{ Campag. Se. Monaco, Fasc. xlvi. p. 327. Iam much indebted to 
Prof. Fauvel for specimens ‘and memoirs. 
