4 PROCEEDIXGS OF THE XATIOXAL MUSEUM. vol.. 65. 



liair-like processes, or perhaps even prickles (lig. D). There is no 

 other Mermin known as yet with such e<i<>shell appendages. 



The female tail end is represented in fii>ure 10; it has the same 

 blunt endino- as that of the male (tig. 11) : the female specimen whose 

 tail end is sketched is slightly intersexual as shown by the presence 

 of male papillae near the end. 



The male tail end is shown in figures 11 and 12. There are two 

 spicnla. rallier short, slightly curved: the retractor muscles are to 

 be seen on ligure 12 and the protractores on figure 11. The male 

 papillae arc arranged in three double series, the longest ventro- 

 medial, the two others submedial (fig. 12). 



7////^.— U.S.N.M.. Ilelminthological Collections No. 2G0T8: para- 

 types No. 260T9. 



LITERATURE CITED. 



Steineu. G., Studien an Neniatoden axis der Xiederelbe. I. Teil : :Merniitlii- 

 den. Mitt. Zool. Mus. Hamburg, vol. 35, 1918. 



MicoLETZKY, H., Mernilthideu iiiid freilebeiide NeiiuUodcu aus <lein (Jruiid- 

 schlanmi des Attersees in Oberosterreich. Zool. Anz., vol. 5.5, p. 240, lOiio. 



EXPLANATION OF PLATES. 



Plate 1. 



AUouicrmis tricliotopson, new species. 



Fig. 1. Lateral view of a male head end; amph, ampliid ; or, mouth opening;; 

 ppl, small supplementary papilla between dorso-sul)medial papilla 

 and amphid ; rtrct oe ))isc, retractor and suspensor muscle of the oral 

 end of the oesophageal tube. 



2. Ventral view of the head end; amph, amphid; ds ppl, dorso-submedial 



papilla ; vs ppl, ventro-submedial papilla ; or mouth opening. 



3. Dorsal view of the head end ; amph, amphid ; dsl p, thickening of the 



subcutanean tissue of the dorsal side;.ppl, dorso-submedial papilla. 



4. Frontal view of the head end; amph, amphid; or, mouth opening: 



s ppl, submedial papilla. 



5. Head end of a female specimen; iirr r: nerve ring: compare tlie 



somewhat smaller amphid of this female witli the ampliid of the 

 male on Fig. 1. 



Plate 2. 



Allo)iicriuis- Iricliotopsoii. new species. 



Fig. 6. Schematic sketch of the amphid; (il, glandular cell; )//t f. nerve fiber: 

 t, terminal. 



7. Ventral view of the vulva, the vagina, and the uteri. 



8. Lateral view of the vulvar section of the body. 



9. Egg. 



10. Female tail end, slightly intersexual; ppl, male papillae. 



11. Lateral view of the male tail end; brs msc, bursal muscle; dct cj. 



ductus ejaculatorius ; f, fat body; p, protractor spiculi ; sp, spiculum. 



12. Ventral view of the male tail end; vm ppl, ventro-medial series of male 



papillae; d vs ppl, vs ppl, dextero-ventro-submedhil series of male 

 papillae. 



