

34 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 75 



There are three pairs of commissures in the combined gizzard seg- 

 ment, two under 8/9 posterior to the gizzard, and one just behind 

 5/6, anterior to the gizzard. The dorsal vessel continues anteriorly- 

 through iv and v. Lateral commissures are also present in seg- 

 ments ix-xiii. 



The anterior pair of testes and funnels are free in x. Segment 

 xi is reduced in size by the nearness of 10/11 and 11/12, ventrally, 

 and their apposition and fusion (?) dorsally. The reduction is 

 increased by the presence laterally of delicate connective tissue 

 between the two septa. When the worm is first opened from the 

 dorsal side, the segment is not at first noticeable, as only three septa 

 are visible between the gizzard and 12/13. The last of these septa 

 appears to be much thicker than the other two. The apparent 

 thickness of the septum is due to the presence between 10/11 and 

 11/12 of testicular material of the same color as the septa. After 

 cutting open the roof of the testicular chamber 11/12 can be traced 



to the parietes ven- 

 tro-laterally and 

 ventrally. On the 

 floor of the cham- 

 ber is the second 

 pair of male fun- 

 nels. The anterior 

 pair of seminal ves- 

 icles is in ix, the 

 vesicles are small 

 and lobed. The 

 posterior vesicles 



Figure 19.— Eutyphoeus hastatus. a. Spermatheca X about 16. 

 6. Tip of penial seta X about 91. c. Ornamentation of penial are muCh larger, ex- 



sETA, OIL IMMERSION tcudlng from 10/11 



to 12/13, pushing 12/13 and 13/14 into contact with 14/15. The 

 prostates are small, tubular, and extend through xvii-xx. The duct 

 is in xvii, short, and looped once or twice. 



The ovaries and oviduct funnels are in the usual positions in xiii. 

 The single pair of spermathecae is in the combined gizzard segment. 



Distribution. — Prome, Thayetmyo. 



Remarks. — Length 85-95 mm. Diameter, 2-2^^ mm. posteriorly 

 to 4-5 anteriorly. The first dorsal pore is in 10/11 in all specimens. 

 Setal interval aa varies from 13^-2 he. The spermathecal pores are 

 in 6, c, or between h and c. 



The unpaired median papillae are in the region aa, extending 

 anteriorly and posterior nearly to the intersegmental furrows of the 

 segment. There are one, two, or three of these markings, located on 

 segment xviii, or on xviii and xix, or xviii, xix, and xx. A few speci- 

 mens have a pair of papillae in xviii instead of the single papilla. 



