BY S. J. JOHNSTON. - 339 



cretory vesicle, modei^ately developed copulatory organs, and 

 in the larger size (in two species at least) ot their eggs, while 

 their intestinal limbs have a length midway between that of 

 a typical brachycoeiine and a typical dicroccEline. Meso- 

 cwiiuniA, then, may be looked upon as a genusi of the sub- 

 family Brachycoeliinae, which brings that subfamily into closer 

 relationship with the Dicrocceliinse than was formerly esti- 

 mated. 



Literature referred to. — -4, 6, 10, 14, 17, 18, 40, 48, 50, 55, 57,58, 

 60, 62, 75, 79, 85, 90, 91, 95, 97, 98. 



After the above was written, 1 had an opportunity, through 

 the kindness of Mr. J. J. Fletcher, the Secretary of the So- 

 ciety, of perusing Dr. Odhner's "Nordostafrikanische Tre- 

 matodeu," published in the Results of the Swedisli Zoological 

 Expedition to Egypt and the White Nile. 1 then found that 

 Dr. Odhner had proposed the generic name Alcsocwibuin, for 

 Liihe's Distontam socicde ; in my paper, 1 had intended to 

 propose a name referring to the variable position of the ovary 

 for this genus, but as Dr. Odhner's name has pi'iority, I have 

 been able to make use of it. While, from an anatomical 

 point of view, the name Alesocahuin is a very suitable one, it 

 seems a pity that a word should be chosen which differs only 

 in its termination from Alesocwia, established by Barrin, in 

 1885, for a genus of animals [Zool. Anz. viii., p. 258J. 



I cannot agree with Odhner, however, in placing this genus 

 in the subfamily Dicrocoeliinge. For the purpose of com- 

 parison, I quote, in parallel columns, on the left and right 

 respectively, Odhner's diagnosis of the subfamilies Dicrocoe- 

 liinae and Brachycoeliiiice, given on pages 88 and 89 of his 

 work (107) ; the words in square brackets are remarks of my 

 own. In the middle column, 1 give the characters of the 

 same parts in Mesoccdtum. A comparison, too, of my own 

 and Liihe's figures of various species of Mesocmlium with 

 Odhner's figure of Brochycoelium crassicolle (107, p. 91), will 

 show the striking resemblance they all bear to one another. 



