226 W. B. BENHAM. 



Prostates flattened, equally bilobed. 



Sperm-sacs. — Two pairs in Somites ix, xii. 



[Prostomium small; dorsal pores present. 



Spermathecse, three pairs, greatly elongated, in Somites vii, 

 VIII, IX; their apertures in ix, x, xi ; not intersegmental in 

 position. 



Two gizzards in Somites vi, vii. 



No accessory intestinal diverticula. 



The intestine is dilated and very vascular in Somites x to 

 XVI ; the following region of the intestine is stated to be 

 coiled like a corkscrew. 



Anterior septa greatly thickened. 



Dorsal vessel doubled in each somite.] 



Species 1. D. sylvaticus, Fletcher; Australia. 



See Fletcher, ' Proc. Linn. Soc. N.S.W.,' 2nd ser., vol. i, 

 1886. 



Genus 5. Perissogaster, Fletcher, 1887. 



Setae not in couples, but all close together on the ventral 

 surface. 



Clitellum on Somites (xiii) xiv to xviii, complete ven- 

 trally except on last somite. 



Male pores slit-like in Somite xviii (?); penial setse 

 present. 



Prostates unequally bilobed. 



Sperm-sacs. — Two or four pairs in Somites ix, x, xi, xii. 

 Testes and ciliated rosettes free, in Somites x, xi. 



Three gizzards in Somites v, vi, vii. 



[Prostomium wide ; no dorsal pores. 



Spermathecse with appendices, two pairs, in Somites viii ; 

 IX ; apertures anterior, intersegmental. 



Intestine with (?) calciferous glands in Somites ix to xiv ; 

 salivary glands present around pharynx.] 



Species 1. P. excavatus, Fletcher, 1887; Australia. 



2. P. nemoralis, Fletcher, 1888; Australia. 



3. P. queenslandica, Fletcher, 1888; Australia. 

 See Fletcher, ^ Proc. Linn. Soc. N.S.W.,^2nd ser., vols, ii, iii. 



